DQR ID | Subject | Data Streams Affected |
---|---|---|
D020628.10 | SGP/EBBR/E4 - T/RH Check | sgp15ebbrE4.a1, sgp30ebbrE4.a1, sgp5ebbrE4.a0 |
D020628.11 | SGP/EBBR/E7 - T/RH Check | sgp15ebbrE7.a1, sgp30ebbrE7.a1, sgp5ebbrE7.a0 |
D020628.13 | SGP/EBBR/E8 - T/RH Check | sgp15ebbrE8.a1, sgp30ebbrE8.a1, sgp5ebbrE8.a0 |
D020628.14 | SGP/EBBR/E9 - T/RH Check | sgp15ebbrE9.a1, sgp30ebbrE9.a1, sgp5ebbrE9.a0 |
D020628.15 | SGP/EBBR/E12 - T/RH Check | sgp15ebbrE12.a1, sgp30ebbrE12.a1, sgp5ebbrE12.a0 |
D020628.16 | SGP/EBBR/E13 - T/RH Check | sgp15ebbrE13.a1, sgp30ebbrE13.a1, sgp5ebbrE13.a0 |
D020628.17 | SGP/EBBR/E15 - T/RH Check | sgp15ebbrE15.a1, sgp30ebbrE15.a1, sgp5ebbrE15.a0 |
D020628.18 | SGP/EBBR/E20 - T/RH Check | sgp15ebbrE20.a1, sgp30ebbrE20.a1, sgp5ebbrE20.a0 |
D020628.19 | SGP/EBBR/E22 - T/RH Check | sgp15ebbrE22.a1, sgp30ebbrE22.a1, sgp5ebbrE22.a0 |
D020701.2 | SGP/EBBR/E4 - Reprocess: Bad soil heat flux sensor #4 | sgp15ebbrE4.a0, sgp30ebbrE4.a1 |
D020701.3 | SGP/EBBR/E4 - Reprocess: Bad soil heat flux sensor #5 | sgp15ebbrE4.a0, sgp30ebbrE4.a1 |
D930428.2 | SGP/EBBR/E13 - incorrect home signal | sgp30ebbrE13.a1, sgp5ebbrE13.a0 |
D930503.1 | EBBR - soil heat flux plate giving opposite sign | sgp30ebbrE20.a1, sgp5ebbrE20.a0 |
D930503.2 | SGP/EBBR/E13 - incorrect meteorological observations | sgp30ebbrE13.a1, sgp5ebbrE13.a0 |
D931108.3 | SGP/EBBR/E13 - pressure calibration | sgp30ebbrE13.a1 |
D931108.4 | SGP/EBBR/E13 - solid moisture correction | sgp30ebbrE13.a1 |
D931108.5 | SGP/EBBR/E4 - Reprocess: Intermittently bad soil heat flux sensor #4 | sgp15ebbrE4.a0, sgp30ebbrE4.a1 |
D931108.6 | SGP/EBBR/E9 - pressure calibration | sgp30ebbrE9.a1 |
D931115.2 | SGP/EBBR/E4 - AEM malfunction | sgp15ebbrE4.a0, sgp30ebbrE4.a1, sgp5ebbrE4.a0 |
D931115.3 | SGP/EBBR/E8 - Drop in atmospheric pressure | sgp15ebbrE8.a0, sgp30ebbrE8.a1, sgp5ebbrE8.a0 |
D940105.1 | Incorrect readings for pressure sensor | sgp15ebbrE15.a1, sgp30ebbrE15.a1, sgp5ebbrE15.a0 |
D940105.10 | SGP/EBBR/E22 - Air Temperature Sensor malfunction | sgp15ebbrE22.a1, sgp30ebbrE22.a1, sgp5ebbrE22.a0 |
D940105.2 | SGP/EBBR/E20 - Blown fuse in AEM at E20 | sgp15ebbrE20.a0, sgp30ebbrE20.a1, sgp5ebbrE20.a0 |
D940105.4 | SGP/EBBR/E15 - Questionable data due to low voltage at E15 | sgp15ebbrE15.a0, sgp30ebbrE15.a1, sgp5ebbrE15.a0 |
D940105.7 | SGP/EBBR/E22 - Incorrect averaging interval at E22 | sgp30ebbrE22.a1 |
D940105.8 | SGP/EBBR/E20 - Reprocess: Questionable data in soil heat fluxes at E20 | sgp15ebbrE20.a0, sgp30ebbrE20.a1 |
D940106.1 | SGP/EBBR/E8 - Invalid data due to AEM fuse blow out at E8 | sgp15ebbrE8.a1, sgp30ebbrE8.a1, sgp5ebbrE8.a0 |
D940106.2 | SGP/EBBR/E12 - Invalid data due to blown AEM fuse at E12 | sgp15ebbrE12.a1, sgp30ebbrE12.a1, sgp5ebbrE12.a0 |
D940106.3 | SGP/EBBR/E4 - Invalid data during E4 battery exchange | sgp15ebbrE4.a1, sgp30ebbrE4.a1, sgp5ebbrE4.a0 |
D940106.4 | SGP/EBBR/E4 - Invalid data due to AEM not exchanging | sgp30ebbrE4.a1 |
D940106.5 | SGP/EBBR/E13 - Invalid data during disconnection of AEM at E13 | sgp15ebbrE13.a1, sgp30ebbrE13.a1, sgp5ebbrE13.a0 |
D940211.2 | SGP/EBBR/E8 - Invalid wind data frozen sensor | sgp15ebbrE8.a1, sgp30ebbrE8.a1, sgp5ebbrE8.a0 |
D940301.1 | SGP/EBBR/E4 - Invalid data during shutdown for PM on 2/10/94 | sgp15ebbrE4.a1, sgp30ebbrE4.a1, sgp5ebbrE4.a0 |
D940301.3 | SGP/EBBR/E8 - Invalid wind speed frozen sensor | sgp15ebbrE8.a1, sgp30ebbrE8.a1, sgp5ebbrE8.a0 |
D940301.4 | Invalid wind speed frozen sensor | sgp15ebbrE7.a1, sgp30ebbrE7.a1, sgp5ebbrE7.a0 |
D940301.5 | SGP/EBBR/E4 - Invalid wind speed frozen sensor | sgp15ebbrE4.a1, sgp30ebbrE4.a1, sgp5ebbrE4.a0 |
D940301.6 | SGP/EBBR/E9 - Invalid wind speed frozen sensor | sgp15ebbrE9.a1, sgp30ebbrE9.a1, sgp5ebbrE9.a0 |
D940329.2 | SGP/EBBR/E20 - Pressure Sensor Malfunction | sgp15ebbrE20.a1, sgp30ebbrE20.a1, sgp5ebbrE20.a0 |
D940329.3 | SGP/E9/EBBR - AEM Malfunction | sgp30ebbrE9.a1, sgp5ebbrE9.a0 |
D940329.4 | SGP/EBBR/E4 - Improper Net Radiometer Calibration | sgp15ebbrE4.a1, sgp30ebbrE4.a1, sgp5ebbrE4.a0 |
D940503.1 | SGP/EBBR/E9 - AEM failure | sgp30ebbrE9.a1 |
D940511.2 | SGP/EBBR/E13 - SM4 Replacement | sgp15ebbrE13.a1, sgp30ebbrE13.a1 |
D940607.1 | SGP/EBBR/E4 - Soil Heat Flux Plate #5 | sgp15ebbrE4.a1, sgp30ebbrE4.a1, sgp5ebbrE4.a0 |
D940616.3 | SGP/EBBR/E12 - Wind Direction | sgp15ebbrE12.a1, sgp30ebbrE12.a1, sgp5ebbrE12.a0 |
D940616.4 | SGP/EBBR/E20 - Soil Moisture Probe | sgp15ebbrE20.a1, sgp30ebbrE20.a1 |
D940707.1 | SGP/EBBR/E4 - Pressure | sgp15ebbrE4.a1, sgp30ebbrE4.a1, sgp5ebbrE4.a0 |
D940711.2 | SGP/EBBR/E9 - Reprocess: Soil Heat Flow Sensor Failure | sgp15ebbrE9.a1, sgp30ebbrE9.a1 |
D940711.3 | SGP/EBBR/E12 - Aspirator Failure | sgp15ebbrE12.a1, sgp30ebbrE12.a1, sgp5ebbrE12.a0 |
D940711.4 | SGP/EBBR/E7 - Reprocess: Soil Temperature Probe Failure | sgp15ebbrE7.a1, sgp30ebbrE7.a1 |
D940720.1 | SGP/EBBR/E4 - Wind Direction Sensor Malfunction | sgp15ebbrE4.a1, sgp30ebbrE4.a1, sgp5ebbrE4.a0 |
D940808.2 | SGP/EBBR/E12 - Stopped Ventilation Fan | sgp15ebbrE12.a1, sgp30ebbrE12.a1, sgp5ebbrE12.a0 |
D940826.1 | SGP/EBBR/E9 - Malfunctioning Wind Dir Sensor, Incorrect SM2 Results | sgp15ebbrE9.a1, sgp30ebbrE9.a1, sgp5ebbrE9.a0 |
D940826.2 | SGP/EBBR/E9 - Reprocess: Soil Heat Flux Out of Range | sgp15ebbrE9.a1, sgp30ebbrE9.a1 |
D940830.10 | SGP/EBBR/E8 - Battery Voltage Drop | sgp15ebbrE8.a1, sgp30ebbrE8.a1, sgp5ebbrE8.a0 |
D940830.7 | SGP/EBBR/E9 - Hail Damage to Net Radiometer and Wind Speed Sensor | sgp15ebbrE9.a1, sgp30ebbrE9.a1, sgp5ebbrE9.a0 |
D940830.8 | Stopped Ventilation Fan | sgp15ebbrE7.a1, sgp30ebbrE7.a1, sgp5ebbrE7.a0 |
D940909.1 | SGP/EBBR/E12 - Miscellaneous Problems Affecting Data | sgp15ebbrE12.a1, sgp30ebbrE12.a1, sgp5ebbrE12.a0 |
D940912.1 | SGP/EBBR/E8 - Data Corruption and Loss | sgp15ebbrE8.a1, sgp30ebbrE8.a1, sgp5ebbrE8.a0 |
D940921.1 | SGP/EBBR/E20 - Fan Stopped, T and RH Biases | sgp15ebbrE20.a1, sgp30ebbrE20.a1, sgp5ebbrE20.a0 |
D940926.1 | Intermittent Stopped or Slowed Aspirator Fans | sgp15ebbrE7.a1, sgp30ebbrE7.a1, sgp5ebbrE7.a0 |
D941021.1 | SGP/EBBR/E20 - Soil Moisture Probe Failure | sgp15ebbrE20.a1, sgp30ebbrE20.a1 |
D941021.10 | SGP/EBBR/E22 - Net Radiometer Hemisphere Changes | sgp15ebbrE22.a1, sgp30ebbrE22.a1, sgp5ebbrE22.a0 |
D941021.12 | SGP/EBBR/E12 - Net Radiometer Hemisphere Changes | sgp15ebbrE12.a1, sgp30ebbrE12.a1, sgp5ebbrE12.a0 |
D941021.13 | SGP/EBBR/E15 - Net Radiometer Hemisphere Changes | sgp15ebbrE15.a1, sgp30ebbrE15.a1, sgp5ebbrE15.a0 |
D941021.2 | SGP/EBBR/E20 - Aspirator Fan Stoppage | sgp15ebbrE20.a1, sgp30ebbrE20.a1 |
D941021.5 | SGP/EBBR/E13 - Soil Temperature Aberations | sgp15ebbrE13.a1, sgp30ebbrE13.a1 |
D941021.6 | SGP/EBBR/E12 - Low home_15 Values | sgp15ebbrE12.a1, sgp30ebbrE12.a1, sgp5ebbrE12.a0 |
D941021.7 | SGP/EBBR/E20 - Net Radiometer Hemisphere Changes | sgp15ebbrE20.a1, sgp30ebbrE20.a1, sgp5ebbrE20.a0 |
D941021.8 | SGP/EBBR/E15 - Net Radiometer Hemisphere Changes | sgp15ebbrE15.a1, sgp30ebbrE15.a1, sgp5ebbrE15.a0 |
D941021.9 | SGP/EBBR/E20 - Net Radiometer Hemisphere Changes | sgp15ebbrE20.a1, sgp30ebbrE20.a1, sgp5ebbrE20.a0 |
D941114.2 | SGP/EBBR/E8 - Water in Net Radiometer | sgp15ebbrE8.a1, sgp30ebbrE8.a1, sgp5ebbrE8.a0 |
D941114.3 | SGP/EBBR/E7 - Net Radiometer not level | sgp15ebbrE7.a1, sgp30ebbrE7.a1, sgp5ebbrE7.a0 |
D941208.1 | SGP/EBBR/E13 - Net Radiation - Hemisphere Replacement | sgp15ebbrE13.a1, sgp30ebbrE13.a1, sgp5ebbrE13.a0 |
D941208.2 | SGP/EBBR/E7 - Radiation Shield Problem | sgp30ebbrE7.a1, sgp5ebbrE7.a0 |
D941212.2 | SGP/EBBR/E4 - Frozen Wind Instruments | sgp15ebbrE4.a1, sgp30ebbrE4.a1, sgp5ebbrE4.a0 |
D941212.3 | SGP/EBBR/E8 - Frozen Wind Instruments | sgp15ebbrE8.a1, sgp30ebbrE8.a1, sgp5ebbrE8.a0 |
D950126.2 | SGP/EBBR/E9 - Reprocess: Soil Heat Flow Sensor 5 Incorrect Data | sgp15ebbrE9.a1, sgp30ebbrE9.a1 |
D950308.4 | SGP/EBBR/E4 - Frozen Wind Speed Sensor | sgp15ebbrE4.a1, sgp30ebbrE4.a1, sgp5ebbrE4.a0 |
Start Date | Start Time | End Date | End Time |
---|---|---|---|
11/03/1994 | 1620 | 11/03/1994 | 1800 |
Subject: | SGP/EBBR/E4 - T/RH Check |
DataStreams: | sgp15ebbrE4.a1, sgp30ebbrE4.a1, sgp5ebbrE4.a0 |
Description: | During the month of November 1994, site operations personnel conducted field comparisons of the temperature and relative humidity sensors in the EBBRs and the HMI31 portable T/RH meter (with the removable probe). As is reflected in the home signal output, the automatic exchange mechanism was disabled in order to conduct the checks. Measurements were taken every 5 minutes, for a half hour each in the aspirated radiation shields (the HMI31 was inserted into the EBBR aspirated radiation shield to provide the same aspiration as the EBBR sensors received). Measurements of aspirator flow were also recorded. This information was provided to the mentor. The mentor then compared the field checks with the data recorded by the EBBRs. The periods of data and data fields that are incorrect because of the checks are listed below. Times are those at which the data are reported. Data Fields 5 minute: tair_top, tair_bot, thum_top, thum_bot, hum_top, hum_bot, vp_top, vp_bot 15 minute: rr_thum_r, rr_thum_l, mv_hum_r, mv_hum_l, tair_r, tair_l 30 minute: tair_top, tair_bot, thum_top, thum_bot, hum_top, hum_bot, vp_top, vp_bot, bowen, e, h 5 minute: 1620, 1625, 1630, 1635, 1640, 1645, 1650, 1655, 1700, 1705, 1710, 1715, 1720, 1725, 1730, 1735, 1740 15 minute: 1630, 1645, 1700, 1715, 1730, 1745 30 minute: 1630, 1700, 1730, 1800 (EDITORS NOTE: The following analysis refers to all EBBRs installed in Nov 1994) Results of the T/RH comparisons: The combined accuracy of the HMI31 and EBBR temperature sensors (thermocouples or PRTDs) is +/- 0.4 degrees C. The combined accuracy of the HMI31 and EBBR RH sensors is +/- 4% for RH less than 80%, and +/- 6% for RH greater than 80%. The combined accuracy for each pair of EBBR sensors of the same type is essentially the same as the quantities stated above. All of the pairs of EBBR sensors show differences that fall within the stated combined accuracies. Although this sounds wonderful, a few of the differences are close to the combined accuracy, which, because of the small differences in temperature being measured (normally smaller than the magnitude of the combined accuracy) could lead to some incorrect estimation of sensible and latent heat flux. However, unless there would be substantial differences of calibration slope of two sensors in a pair, the switching of height of the sensors every 15 minutes by the automatic exchange mechanism will remove the offset between the sensors. The comparisons between the EBBR sensors and the HMI31 T/RH meter showed much larger differences. The range of differences were: -2.4 to 0.0 degrees for the thermocouples, -2.1 to 0.1 degrees for the RH probe PRTDs, and -6.6 to 6.7 percent for the RH sensors. Six Thermocouples indicated differences from the HMI31 greater than the combined accuracy. Seven PRTDs indicated differences from the HMI31 greater than the combined accuracy. Four RH sensors indicated differences from the HMI31 greater than the combined accuracy. The temperature differences (for both thermocouples and PRTDs) were nearly all of one sign; the HMI31 indicated the greater temperature, which may suggest a bias in the HMI31 temperature measurement, even though a dozen differences of +/- 0.2 degrees were measured. Four differences of zero and only one positive difference (out of 40) were measured. Thirteen of the 20 RH differences were positive (HMI31 indicating the lower RH), with the differences near the level of the combined accuracies being approximately 50% positive and 50% negative. It does not appear that the HMI31 has a RH bias. Plots of EBBR sensor/HMI31 differences as a function of time from the installation of the individual sensors (a range of 10 to 30 months in the field) shows no obvious pattern of sensor drift with time. This is encouraging. |
Measurements: | sgp5ebbrE4.a0:
sgp15ebbrE4.a1:
sgp30ebbrE4.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
11/15/1994 | 1605 | 11/15/1994 | 1800 |
Subject: | SGP/EBBR/E7 - T/RH Check |
DataStreams: | sgp15ebbrE7.a1, sgp30ebbrE7.a1, sgp5ebbrE7.a0 |
Description: | During the month of November 1994, site operations personnel conducted field comparisons of the temperature and relative humidity sensors in the EBBRs and the HMI31 portable T/RH meter (with the removable probe). As is reflected in the home signal output, the automatic exchange mechanism was disabled in order to conduct the checks. Measurements were taken every 5 minutes, for a half hour each in the aspirated radiation shields (the HMI31 was inserted into the EBBR aspirated radiation shield to provide the same aspiration as the EBBR sensors received). Measurements of aspirator flow were also recorded. This information was provided to the mentor. The mentor then compared the field checks with the data recorded by the EBBRs. The periods of data and data fields that are incorrect because of the checks are listed below. Times are those at which the data are reported. Data Fields 5 minute: tair_top, tair_bot, thum_top, thum_bot, hum_top, hum_bot, vp_top, vp_bot 15 minute: rr_thum_r, rr_thum_l, mv_hum_r, mv_hum_l, tair_r, tair_l 30 minute: tair_top, tair_bot, thum_top, thum_bot, hum_top, hum_bot, vp_top, vp_bot, bowen, e, h 5 minute: 1605, 1610, 1615, 1620, 1625, 1630, 1635, 1640, 1645, 1650, 1655, 1700, 1705, 1710, 1715, 1720, 1725, 1730, 1735, 1740, 1745, 1750 15 minute: 1615, 1630, 1645, 1700, 1715, 1730, 1745, 1800 30 minute: 1630, 1700, 1730, 1800 (EDITOR'S NOTE: The following analysis refers to all EBBRs installed in Nov 1994) Results of the T/RH comparisons: The combined accuracy of the HMI31 and EBBR temperature sensors (thermocouples or PRTDs) is +/- 0.4 degrees C. The combined accuracy of the HMI31 and EBBR RH sensors is +/- 4% for RH less than 80%, and +/- 6% for RH greater than 80%. The combined accuracy for each pair of EBBR sensors of the same type is essentially the same as the quantities stated above. All of the pairs of EBBR sensors show differences that fall within the stated combined accuracies. Although this sounds wonderful, a few of the differences are close to the combined accuracy, which, because of the small differences in temperature being measured (normally smaller than the magnitude of the combined accuracy) could lead to some incorrect estimation of sensible and latent heat flux. However, unless there would be substantial differences of calibration slope of two sensors in a pair, the switching of height of the sensors every 15 minutes by the automatic exchange mechanism will remove the offset between the sensors. The comparisons between the EBBR sensors and the HMI31 T/RH meter showed much larger differences. The range of differences were: -2.4 to 0.0 degrees for the thermocouples, -2.1 to 0.1 degrees for the RH probe PRTDs, and -6.6 to 6.7 percent for the RH sensors. Six Thermocouples indicated differences from the HMI31 greater than the combined accuracy. Seven PRTDs indicated differences from the HMI31 greater than the combined accuracy. Four RH sensors indicated differences from the HMI31 greater than the combined accuracy. The temperature differences (for both thermocouples and PRTDs) were nearly all of one sign; the HMI31 indicated the greater temperature, which may suggest a bias in the HMI31 temperature measurement, even though a dozen differences of +/- 0.2 degrees were measured. Four differences of zero and only one positive difference (out of 40) were measured. Thirteen of the 20 RH differences were positive (HMI31 indicating the lower RH), with the differences near the level of the combined accuracies being approximately 50% positive and 50% negative. It does not appear that the HMI31 has a RH bias. Plots of EBBR sensor/HMI31 differences as a function of time from the installation of the individual sensors (a range of 10 to 30 months in the field) shows no obvious pattern of sensor drift with time. This is encouraging. |
Measurements: | sgp15ebbrE7.a1:
sgp30ebbrE7.a1:
sgp5ebbrE7.a0:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
11/02/1994 | 1640 | 11/02/1994 | 1900 |
Subject: | SGP/EBBR/E8 - T/RH Check |
DataStreams: | sgp15ebbrE8.a1, sgp30ebbrE8.a1, sgp5ebbrE8.a0 |
Description: | During the month of November 1994, site operations personnel conducted field comparisons of the temperature and relative humidity sensors in the EBBRs and the HMI31 portable T/RH meter (with the removable probe). As is reflected in the home signal output, the automatic exchange mechanism was disabled in order to conduct the checks. Measurements were taken every 5 minutes, for a half hour each in the aspirated radiation shields (the HMI31 was inserted into the EBBR aspirated radiation shield to provide the same aspiration as the EBBR sensors received). Measurements of aspirator flow were also recorded. This information was provided to the mentor. The mentor then compared the field checks with the data recorded by the EBBRs. The periods of data and data fields that are incorrect because of the checks are listed below. Times are those at which the data are reported. Data Fields 5 minute: tair_top, tair_bot, thum_top, thum_bot, hum_top, hum_bot, vp_top, vp_bot 15 minute: rr_thum_r, rr_thum_l, mv_hum_r, mv_hum_l, tair_r, tair_l 30 minute: tair_top, tair_bot, thum_top, thum_bot, hum_top, hum_bot, vp_top, vp_bot, bowen, e, h 5 minute: 1640, 1645, 1650, 1655, 1700, 1705, 1710, 1715, 1720, 1725, 1730, 1735, 1740, 1745, 1750, 1755, 1800, 1805, 1810, 1815, 1820, 1825, 1830, 1835 15 minute: 1645, 1700, 1715, 1730, 1745, 1800, 1815, 1830, 1845 30 minute: 1700, 1730, 1800, 1830, 1900 (EDITOR'S NOTE: The following analysis referrs to all EBBRs installed in Nov 1994) Results of the T/RH comparisons: The combined accuracy of the HMI31 and EBBR temperature sensors (thermocouples or PRTDs) is +/- 0.4 degrees C. The combined accuracy of the HMI31 and EBBR RH sensors is +/- 4% for RH less than 80%, and +/- 6% for RH greater than 80%. The combined accuracy for each pair of EBBR sensors of the same type is essentially the same as the quantities stated above. All of the pairs of EBBR sensors show differences that fall within the stated combined accuracies. Although this sounds wonderful, a few of the differences are close to the combined accuracy, which, because of the small differences in temperature being measured (normally smaller than the magnitude of the combined accuracy) could lead to some incorrect estimation of sensible and latent heat flux. However, unless there would be substantial differences of calibration slope of two sensors in a pair, the switching of height of the sensors every 15 minutes by the automatic exchange mechanism will remove the offset between the sensors. The comparisons between the EBBR sensors and the HMI31 T/RH meter showed much larger differences. The range of differences were: -2.4 to 0.0 degrees for the thermocouples, -2.1 to 0.1 degrees for the RH probe PRTDs, and -6.6 to 6.7 percent for the RH sensors. Six Thermocouples indicated differences from the HMI31 greater than the combined accuracy. Seven PRTDs indicated differences from the HMI31 greater than the combined accuracy. Four RH sensors indicated differences from the HMI31 greater than the combined accuracy. The temperature differences (for both thermocouples and PRTDs) were nearly all of one sign; the HMI31 indicated the greater temperature, which may suggest a bias in the HMI31 temperature measurement, even though a dozen differences of +/- 0.2 degrees were measured. Four differences of zero and only one positive difference (out of 40) were measured. Thirteen of the 20 RH differences were positive (HMI31 indicating the lower RH), with the differences near the level of the combined accuracies being approximately 50% positive and 50% negative. It does not appear that the HMI31 has a RH bias. Plots of EBBR sensor/HMI31 differences as a function of time from the installation of the individual sensors (a range of 10 to 30 months in the field) shows no obvious pattern of sensor drift with time. This is encouraging. |
Measurements: | sgp15ebbrE8.a1:
sgp5ebbrE8.a0:
sgp30ebbrE8.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
11/14/1994 | 1820 | 11/14/1994 | 2000 |
Subject: | SGP/EBBR/E9 - T/RH Check |
DataStreams: | sgp15ebbrE9.a1, sgp30ebbrE9.a1, sgp5ebbrE9.a0 |
Description: | During the month of November 1994, site operations personnel conducted field comparisons of the temperature and relative humidity sensors in the EBBRs and the HMI31 portable T/RH meter (with the removable probe). As is reflected in the home signal output, the automatic exchange mechanism was disabled in order to conduct the checks. Measurements were taken every 5 minutes, for a half hour each in the aspirated radiation shields (the HMI31 was inserted into the EBBR aspirated radiation shield to provide the same aspiration as the EBBR sensors received). Measurements of aspirator flow were also recorded. This information was provided to the mentor. The mentor then compared the field checks with the data recorded by the EBBRs. The periods of data and data fields that are incorrect because of the checks are listed below. Times are those at which the data are reported. Data Fields 5 minute: tair_top, tair_bot, thum_top, thum_bot, hum_top, hum_bot, vp_top, vp_bot 15 minute: rr_thum_r, rr_thum_l, mv_hum_r, mv_hum_l, tair_r, tair_l 30 minute: tair_top, tair_bot, thum_top, thum_bot, hum_top, hum_bot, vp_top, vp_bot, bowen, e, h 5 minute: 1820, 1825, 1830, 1835, 1840, 1845, 1850, 1855, 1900, 1905, 1910, 1915, 1920, 1925, 1930, 1935, 1940, 1945 15 minute: 1830, 1845, 1900, 1915, 1930, 1945 30 minute: 1830, 1900, 1930, 2000 (EDITOR'S NOTE: The following analysis refers to all EBBRs installed in Nov 1994) Results of the T/RH comparisons: The combined accuracy of the HMI31 and EBBR temperature sensors (thermocouples or PRTDs) is +/- 0.4 degrees C. The combined accuracy of the HMI31 and EBBR RH sensors is +/- 4% for RH less than 80%, and +/- 6% for RH greater than 80%. The combined accuracy for each pair of EBBR sensors of the same type is essentially the same as the quantities stated above. All of the pairs of EBBR sensors show differences that fall within the stated combined accuracies. Although this sounds wonderful, a few of the differences are close to the combined accuracy, which, because of the small differences in temperature being measured (normally smaller than the magnitude of the combined accuracy) could lead to some incorrect estimation of sensible and latent heat flux. However, unless there would be substantial differences of calibration slope of two sensors in a pair, the switching of height of the sensors every 15 minutes by the automatic exchange mechanism will remove the offset between the sensors. The comparisons between the EBBR sensors and the HMI31 T/RH meter showed much larger differences. The range of differences were: -2.4 to 0.0 degrees for the thermocouples, -2.1 to 0.1 degrees for the RH probe PRTDs, and -6.6 to 6.7 percent for the RH sensors. Six Thermocouples indicated differences from the HMI31 greater than the combined accuracy. Seven PRTDs indicated differences from the HMI31 greater than the combined accuracy. Four RH sensors indicated differences from the HMI31 greater than the combined accuracy. The temperature differences (for both thermocouples and PRTDs) were nearly all of one sign; the HMI31 indicated the greater temperature, which may suggest a bias in the HMI31 temperature measurement, even though a dozen differences of +/- 0.2 degrees were measured. Four differences of zero and only one positive difference (out of 40) were measured. Thirteen of the 20 RH differences were positive (HMI31 indicating the lower RH), with the differences near the level of the combined accuracies being approximately 50% positive and 50% negative. It does not appear that the HMI31 has a RH bias. Plots of EBBR sensor/HMI31 differences as a function of time from the installation of the individual sensors (a range of 10 to 30 months in the field) shows no obvious pattern of sensor drift with time. This is encouraging. |
Measurements: | sgp5ebbrE9.a0:
sgp15ebbrE9.a1:
sgp30ebbrE9.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
11/23/1994 | 1515 | 11/23/1994 | 1630 |
Subject: | SGP/EBBR/E12 - T/RH Check |
DataStreams: | sgp15ebbrE12.a1, sgp30ebbrE12.a1, sgp5ebbrE12.a0 |
Description: | During the month of November 1994, site operations personnel conducted field comparisons of the temperature and relative humidity sensors in the EBBRs and the HMI31 portable T/RH meter (with the removable probe). As is reflected in the home signal output, the automatic exchange mechanism was disabled in order to conduct the checks. Measurements were taken every 5 minutes, for a half hour each in the aspirated radiation shields (the HMI31 was inserted into the EBBR aspirated radiation shield to provide the same aspiration as the EBBR sensors received). Measurements of aspirator flow were also recorded. This information was provided to the mentor. The mentor then compared the field checks with the data recorded by the EBBRs. The periods of data and data fields that are incorrect because of the checks are listed below. Times are those at which the data are reported. Data Fields 5 minute: tair_top, tair_bot, thum_top, thum_bot, hum_top, hum_bot, vp_top, vp_bot 15 minute: rr_thum_r, rr_thum_l, mv_hum_r, mv_hum_l, tair_r, tair_l 30 minute: tair_top, tair_bot, thum_top, thum_bot, hum_top, hum_bot, vp_top, vp_bot, bowen, e, h 5 minute: 1515, 1520, 1525, 1530, 1535, 1540, 1545, 1550, 1555, 1600, 1605, 1610 15 minute: 1515, 1530, 1545, 1600, 1615 30 minute: 1530, 1600, 1630 (EDITOR'S NOTE: The following analysis refers to all EBBRs installed in Nov 1994) Results of the T/RH comparisons: The combined accuracy of the HMI31 and EBBR temperature sensors (thermocouples or PRTDs) is +/- 0.4 degrees C. The combined accuracy of the HMI31 and EBBR RH sensors is +/- 4% for RH less than 80%, and +/- 6% for RH greater than 80%. The combined accuracy for each pair of EBBR sensors of the same type is essentially the same as the quantities stated above. All of the pairs of EBBR sensors show differences that fall within the stated combined accuracies. Although this sounds wonderful, a few of the differences are close to the combined accuracy, which, because of the small differences in temperature being measured (normally smaller than the magnitude of the combined accuracy) could lead to some incorrect estimation of sensible and latent heat flux. However, unless there would be substantial differences of calibration slope of two sensors in a pair, the switching of height of the sensors every 15 minutes by the automatic exchange mechanism will remove the offset between the sensors. The comparisons between the EBBR sensors and the HMI31 T/RH meter showed much larger differences. The range of differences were: -2.4 to 0.0 degrees for the thermocouples, -2.1 to 0.1 degrees for the RH probe PRTDs, and -6.6 to 6.7 percent for the RH sensors. Six Thermocouples indicated differences from the HMI31 greater than the combined accuracy. Seven PRTDs indicated differences from the HMI31 greater than the combined accuracy. Four RH sensors indicated differences from the HMI31 greater than the combined accuracy. The temperature differences (for both thermocouples and PRTDs) were nearly all of one sign; the HMI31 indicated the greater temperature, which may suggest a bias in the HMI31 temperature measurement, even though a dozen differences of +/- 0.2 degrees were measured. Four differences of zero and only one positive difference (out of 40) were measured. Thirteen of the 20 RH differences were positive (HMI31 indicating the lower RH), with the differences near the level of the combined accuracies being approximately 50% positive and 50% negative. It does not appear that the HMI31 has a RH bias. Plots of EBBR sensor/HMI31 differences as a function of time from the installation of the individual sensors (a range of 10 to 30 months in the field) shows no obvious pattern of sensor drift with time. This is encouraging. |
Measurements: | sgp5ebbrE12.a0:
sgp30ebbrE12.a1:
sgp15ebbrE12.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
11/04/1994 | 2005 | 11/04/1994 | 2100 |
Subject: | SGP/EBBR/E13 - T/RH Check |
DataStreams: | sgp15ebbrE13.a1, sgp30ebbrE13.a1, sgp5ebbrE13.a0 |
Description: | During the month of November 1994, site operations personnel conducted field comparisons of the temperature and relative humidity sensors in the EBBRs and the HMI31 portable T/RH meter (with the removable probe). As is reflected in the home signal output, the automatic exchange mechanism was disabled in order to conduct the checks. Measurements were taken every 5 minutes, for a half hour each in the aspirated radiation shields (the HMI31 was inserted into the EBBR aspirated radiation shield to provide the same aspiration as the EBBR sensors received). Measurements of aspirator flow were also recorded. This information was provided to the mentor. The mentor then compared the field checks with the data recorded by the EBBRs. The periods of data and data fields that are incorrect because of the checks are listed below. Times are those at which the data are reported. Data Fields 5 minute: tair_top, tair_bot, thum_top, thum_bot, hum_top, hum_bot, vp_top, vp_bot 15 minute: rr_thum_r, rr_thum_l, mv_hum_r, mv_hum_l, tair_r, tair_l 30 minute: tair_top, tair_bot, thum_top, thum_bot, hum_top, hum_bot, vp_top, vp_bot, bowen, e, h 5 minute: 2005, 2010, 2015, 2020, 2025, 2030, 2035, 2040, 2045, 2050, 2055, 2100, 2105 15 minute: 2015, 2045, 2100, 2115 30 minute: 2030, 2100 (EDITOR'S NOTE: The following analysis refers to all EBBRs installed in Nov 1994) Results of the T/RH comparisons: The combined accuracy of the HMI31 and EBBR temperature sensors (thermocouples or PRTDs) is +/- 0.4 degrees C. The combined accuracy of the HMI31 and EBBR RH sensors is +/- 4% for RH less than 80%, and +/- 6% for RH greater than 80%. The combined accuracy for each pair of EBBR sensors of the same type is essentially the same as the quantities stated above. All of the pairs of EBBR sensors show differences that fall within the stated combined accuracies. Although this sounds wonderful, a few of the differences are close to the combined accuracy, which, because of the small differences in temperature being measured (normally smaller than the magnitude of the combined accuracy) could lead to some incorrect estimation of sensible and latent heat flux. However, unless there would be substantial differences of calibration slope of two sensors in a pair, the switching of height of the sensors every 15 minutes by the automatic exchange mechanism will remove the offset between the sensors. The comparisons between the EBBR sensors and the HMI31 T/RH meter showed much larger differences. The range of differences were: -2.4 to 0.0 degrees for the thermocouples, -2.1 to 0.1 degrees for the RH probe PRTDs, and -6.6 to 6.7 percent for the RH sensors. Six Thermocouples indicated differences from the HMI31 greater than the combined accuracy. Seven PRTDs indicated differences from the HMI31 greater than the combined accuracy. Four RH sensors indicated differences from the HMI31 greater than the combined accuracy. The temperature differences (for both thermocouples and PRTDs) were nearly all of one sign; the HMI31 indicated the greater temperature, which may suggest a bias in the HMI31 temperature measurement, even though a dozen differences of +/- 0.2 degrees were measured. Four differences of zero and only one positive difference (out of 40) were measured. Thirteen of the 20 RH differences were positive (HMI31 indicating the lower RH), with the differences near the level of the combined accuracies being approximately 50% positive and 50% negative. It does not appear that the HMI31 has a RH bias. Plots of EBBR sensor/HMI31 differences as a function of time from the installation of the individual sensors (a range of 10 to 30 months in the field) shows no obvious pattern of sensor drift with time. This is encouraging. |
Measurements: | sgp5ebbrE13.a0:
sgp15ebbrE13.a1:
sgp30ebbrE13.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
11/07/1994 | 1650 | 11/07/1994 | 1830 |
Subject: | SGP/EBBR/E15 - T/RH Check |
DataStreams: | sgp15ebbrE15.a1, sgp30ebbrE15.a1, sgp5ebbrE15.a0 |
Description: | During the month of November 1994, site operations personnel conducted field comparisons of the temperature and relative humidity sensors in the EBBRs and the HMI31 portable T/RH meter (with the removable probe). As is reflected in the home signal output, the automatic exchange mechanism was disabled in order to conduct the checks. Measurements were taken every 5 minutes, for a half hour each in the aspirated radiation shields (the HMI31 was inserted into the EBBR aspirated radiation shield to provide the same aspiration as the EBBR sensors received). Measurements of aspirator flow were also recorded. This information was provided to the mentor. The mentor then compared the field checks with the data recorded by the EBBRs. The periods of data and data fields that are incorrect because of the checks are listed below. Times are those at which the data are reported. Data Fields 5 minute: tair_top, tair_bot, thum_top, thum_bot, hum_top, hum_bot, vp_top, vp_bot 15 minute: rr_thum_r, rr_thum_l, mv_hum_r, mv_hum_l, tair_r, tair_l 30 minute: tair_top, tair_bot, thum_top, thum_bot, hum_top, hum_bot, vp_top, vp_bot, bowen, e, h 5 minute: 1650, 1655, 1700, 1705, 1710, 1715, 1720, 1725, 1730, 1735, 1740, 1745, 1750, 1755, 1800, 1805 15 minute: 1700, 1715, 1730, 1745, 1800, 1815 30 minute: 1700, 1730, 1800, 1830 (EDITOR'S NOTE: The following analysis refers to all EBBRs installed in Nov 1994) Results of the T/RH comparisons: The combined accuracy of the HMI31 and EBBR temperature sensors (thermocouples or PRTDs) is +/- 0.4 degrees C. The combined accuracy of the HMI31 and EBBR RH sensors is +/- 4% for RH less than 80%, and +/- 6% for RH greater than 80%. The combined accuracy for each pair of EBBR sensors of the same type is essentially the same as the quantities stated above. All of the pairs of EBBR sensors show differences that fall within the stated combined accuracies. Although this sounds wonderful, a few of the differences are close to the combined accuracy, which, because of the small differences in temperature being measured (normally smaller than the magnitude of the combined accuracy) could lead to some incorrect estimation of sensible and latent heat flux. However, unless there would be substantial differences of calibration slope of two sensors in a pair, the switching of height of the sensors every 15 minutes by the automatic exchange mechanism will remove the offset between the sensors. The comparisons between the EBBR sensors and the HMI31 T/RH meter showed much larger differences. The range of differences were: -2.4 to 0.0 degrees for the thermocouples, -2.1 to 0.1 degrees for the RH probe PRTDs, and -6.6 to 6.7 percent for the RH sensors. Six Thermocouples indicated differences from the HMI31 greater than the combined accuracy. Seven PRTDs indicated differences from the HMI31 greater than the combined accuracy. Four RH sensors indicated differences from the HMI31 greater than the combined accuracy. The temperature differences (for both thermocouples and PRTDs) were nearly all of one sign; the HMI31 indicated the greater temperature, which may suggest a bias in the HMI31 temperature measurement, even though a dozen differences of +/- 0.2 degrees were measured. Four differences of zero and only one positive difference (out of 40) were measured. Thirteen of the 20 RH differences were positive (HMI31 indicating the lower RH), with the differences near the level of the combined accuracies being approximately 50% positive and 50% negative. It does not appear that the HMI31 has a RH bias. Plots of EBBR sensor/HMI31 differences as a function of time from the installation of the individual sensors (a range of 10 to 30 months in the field) shows no obvious pattern of sensor drift with time. This is encouraging. |
Measurements: | sgp5ebbrE15.a0:
sgp30ebbrE15.a1:
sgp15ebbrE15.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
11/10/1994 | 1520 | 11/10/1994 | 1630 |
Subject: | SGP/EBBR/E20 - T/RH Check |
DataStreams: | sgp15ebbrE20.a1, sgp30ebbrE20.a1, sgp5ebbrE20.a0 |
Description: | During the month of November 1994, site operations personnel conducted field comparisons of the temperature and relative humidity sensors in the EBBRs and the HMI31 portable T/RH meter (with the removable probe). As is reflected in the home signal output, the automatic exchange mechanism was disabled in order to conduct the checks. Measurements were taken every 5 minutes, for a half hour each in the aspirated radiation shields (the HMI31 was inserted into the EBBR aspirated radiation shield to provide the same aspiration as the EBBR sensors received). Measurements of aspirator flow were also recorded. This information was provided to the mentor. The mentor then compared the field checks with the data recorded by the EBBRs. The periods of data and data fields that are incorrect because of the checks are listed below. Times are those at which the data are reported. Data Fields 5 minute: tair_top, tair_bot, thum_top, thum_bot, hum_top, hum_bot, vp_top, vp_bot 15 minute: rr_thum_r, rr_thum_l, mv_hum_r, mv_hum_l, tair_r, tair_l 30 minute: tair_top, tair_bot, thum_top, thum_bot, hum_top, hum_bot, vp_top, vp_bot, bowen, e, h 5 minute: 1520, 1525, 1530, 1535, 1540, 1545, 1550, 1555, 1600, 1605 15 minute: 1530, 1545, 1600, 1615 30 minute: 1530, 1600, 1630 (EDITOR'S NOTE: The following analysis refers to all EBBRs installed in Nov 1994) Results of the T/RH comparisons: The combined accuracy of the HMI31 and EBBR temperature sensors (thermocouples or PRTDs) is +/- 0.4 degrees C. The combined accuracy of the HMI31 and EBBR RH sensors is +/- 4% for RH less than 80%, and +/- 6% for RH greater than 80%. The combined accuracy for each pair of EBBR sensors of the same type is essentially the same as the quantities stated above. All of the pairs of EBBR sensors show differences that fall within the stated combined accuracies. Although this sounds wonderful, a few of the differences are close to the combined accuracy, which, because of the small differences in temperature being measured (normally smaller than the magnitude of the combined accuracy) could lead to some incorrect estimation of sensible and latent heat flux. However, unless there would be substantial differences of calibration slope of two sensors in a pair, the switching of height of the sensors every 15 minutes by the automatic exchange mechanism will remove the offset between the sensors. The comparisons between the EBBR sensors and the HMI31 T/RH meter showed much larger differences. The range of differences were: -2.4 to 0.0 degrees for the thermocouples, -2.1 to 0.1 degrees for the RH probe PRTDs, and -6.6 to 6.7 percent for the RH sensors. Six Thermocouples indicated differences from the HMI31 greater than the combined accuracy. Seven PRTDs indicated differences from the HMI31 greater than the combined accuracy. Four RH sensors indicated differences from the HMI31 greater than the combined accuracy. The temperature differences (for both thermocouples and PRTDs) were nearly all of one sign; the HMI31 indicated the greater temperature, which may suggest a bias in the HMI31 temperature measurement, even though a dozen differences of +/- 0.2 degrees were measured. Four differences of zero and only one positive difference (out of 40) were measured. Thirteen of the 20 RH differences were positive (HMI31 indicating the lower RH), with the differences near the level of the combined accuracies being approximately 50% positive and 50% negative. It does not appear that the HMI31 has a RH bias. Plots of EBBR sensor/HMI31 differences as a function of time from the installation of the individual sensors (a range of 10 to 30 months in the field) shows no obvious pattern of sensor drift with time. This is encouraging. |
Measurements: | sgp30ebbrE20.a1:
sgp5ebbrE20.a0:
sgp15ebbrE20.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
11/08/1994 | 1650 | 11/08/1994 | 1800 |
Subject: | SGP/EBBR/E22 - T/RH Check |
DataStreams: | sgp15ebbrE22.a1, sgp30ebbrE22.a1, sgp5ebbrE22.a0 |
Description: | During the month of November 1994, site operations personnel conducted field comparisons of the temperature and relative humidity sensors in the EBBRs and the HMI31 portable T/RH meter (with the removable probe). As is reflected in the home signal output, the automatic exchange mechanism was disabled in order to conduct the checks. Measurements were taken every 5 minutes, for a half hour each in the aspirated radiation shields (the HMI31 was inserted into the EBBR aspirated radiation shield to provide the same aspiration as the EBBR sensors received). Measurements of aspirator flow were also recorded. This information was provided to the mentor. The mentor then compared the field checks with the data recorded by the EBBRs. The periods of data and data fields that are incorrect because of the checks are listed below. Times are those at which the data are reported. Data Fields 5 minute: tair_top, tair_bot, thum_top, thum_bot, hum_top, hum_bot, vp_top, vp_bot 15 minute: rr_thum_r, rr_thum_l, mv_hum_r, mv_hum_l, tair_r, tair_l 30 minute: tair_top, tair_bot, thum_top, thum_bot, hum_top, hum_bot, vp_top, vp_bot, bowen, e, h 5 minute: 1650, 1655, 1700, 1705, 1710, 1715, 1720, 1725, 1730, 1735 15 minute: 1700, 1715, 1730, 1745 30 minute: 1700, 1730, 1800 (EDITOR'S NOTE: The following analysis refers to all EBBRs installed in Nov 1994) Results of the T/RH comparisons: The combined accuracy of the HMI31 and EBBR temperature sensors (thermocouples or PRTDs) is +/- 0.4 degrees C. The combined accuracy of the HMI31 and EBBR RH sensors is +/- 4% for RH less than 80%, and +/- 6% for RH greater than 80%. The combined accuracy for each pair of EBBR sensors of the same type is essentially the same as the quantities stated above. All of the pairs of EBBR sensors show differences that fall within the stated combined accuracies. Although this sounds wonderful, a few of the differences are close to the combined accuracy, which, because of the small differences in temperature being measured (normally smaller than the magnitude of the combined accuracy) could lead to some incorrect estimation of sensible and latent heat flux. However, unless there would be substantial differences of calibration slope of two sensors in a pair, the switching of height of the sensors every 15 minutes by the automatic exchange mechanism will remove the offset between the sensors. The comparisons between the EBBR sensors and the HMI31 T/RH meter showed much larger differences. The range of differences were: -2.4 to 0.0 degrees for the thermocouples, -2.1 to 0.1 degrees for the RH probe PRTDs, and -6.6 to 6.7 percent for the RH sensors. Six Thermocouples indicated differences from the HMI31 greater than the combined accuracy. Seven PRTDs indicated differences from the HMI31 greater than the combined accuracy. Four RH sensors indicated differences from the HMI31 greater than the combined accuracy. The temperature differences (for both thermocouples and PRTDs) were nearly all of one sign; the HMI31 indicated the greater temperature, which may suggest a bias in the HMI31 temperature measurement, even though a dozen differences of +/- 0.2 degrees were measured. Four differences of zero and only one positive difference (out of 40) were measured. Thirteen of the 20 RH differences were positive (HMI31 indicating the lower RH), with the differences near the level of the combined accuracies being approximately 50% positive and 50% negative. It does not appear that the HMI31 has a RH bias. Plots of EBBR sensor/HMI31 differences as a function of time from the installation of the individual sensors (a range of 10 to 30 months in the field) shows no obvious pattern of sensor drift with time. This is encouraging. |
Measurements: | sgp30ebbrE22.a1:
sgp15ebbrE22.a1:
sgp5ebbrE22.a0:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
09/11/1993 | 1700 | 09/23/1993 | 1600 |
Subject: | SGP/EBBR/E4 - Reprocess: Bad soil heat flux sensor #4 |
DataStreams: | sgp15ebbrE4.a0, sgp30ebbrE4.a1 |
Description: | On September 11, 1993 soil heat flux sensor #4 of the Plevna, KS EBBR (E4) malfunctioned. The sensor was replaced September 23, 1993 before 1600. Corrupted 30 minute values of shf4, c_shf4, g4, ave_shf, h, and e, and corrupted 15 minute values of mv_hft4 resulted from the sensor malfunction. The quantities shf4, c_shf4, g4, and mv_hft4 are bad data values and are not recoverable. The other quantities can be recalculated using the three functioning sets of soil sensors. (Note: Soil heat flux sensor #5 was also malfunctioning during the time periods identified and has therefore been eliminated from the recalculation equations. This problem is identified in a separate DQR.) ave_shf = (g1 + g2 + g3)/3 e = -(q + ave_shf)/(1 + bowen) h = -(e + ave_shf + q) |
Measurements: | sgp30ebbrE4.a1:
sgp15ebbrE4.a0:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
09/01/1993 | 0000 | 11/04/1993 | 1900 |
Subject: | SGP/EBBR/E4 - Reprocess: Bad soil heat flux sensor #5 |
DataStreams: | sgp15ebbrE4.a0, sgp30ebbrE4.a1 |
Description: | On September 1, 1993 the EBBR system at Plevna, E4, was relocated in the same field. However, soil contact for soil heat flux plate #5 was not properly established. This resulted in somewhat high positive and very high negative outputs, depending on the direction of soil heat flow. Corrupted 30 minute values of shf4, c_shf4, g4, ave_shf, h, and e, and corrupted 15 minute values of mv_hft4 resulted. The quantities shf4, c_shf4, g4, and mv_hft4 are bad data values and are not recoverable. The other quantities can be recalculated using the four functioning sets of soil sensors. (Note: Soil heat flux sensor #4 was also malfunctioning during part of the time period identified. That problem is identified in two separate DQRs. See D931108.5 and D020701.2 for the equations to use while sensor #4 was not working properly) ave_shf = (g1 + g2 + g3 + g4)/4 e = -(q + ave_shf)/(1 + bowen) h = -(e + ave_shf + q) |
Measurements: | sgp30ebbrE4.a1:
sgp15ebbrE4.a0:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
07/13/1993 | 1201 | 07/13/1993 | 1202 |
Subject: | SGP/EBBR/E13 - incorrect home signal |
DataStreams: | sgp30ebbrE13.a1, sgp5ebbrE13.a0 |
Description: | EDITOR'S NOTE: This DQR refers to data collected by the EBBR at E13 prior to the begin date of regular ARM data. At that time, the data streams which contain the EBBR.E13 data were named Dsgp15ebbr1.a0 Dsgp30ebbr1.a1 Dsgp5ebbr1.a0 These data are not readily available from the ARM archive, but can be made available by special request. The actual time range of the problem described here is 921230.0000-930423.1200. EBBR1, Central Facility reported incorrect home value signals from 30 December 1992 through 23 April 1993. The home signals are used in the calculation of fluxes by the CR10 data logger. The fluxes for this period are thus invalid as reported and must be recalculated from the archived 15 minute data. The proper home signals are less than 35 for 30 minute home signal and greater than 35 for 15 minute home signal. Home signals were the same value for 15 minute and 30 minute during the period of interest, although they were not a constant value. The chronology of the situation is reported below. On 7 April 1993 I noticed the problem in the A0 data. On 30 December 1992, the automatic exchange mechanism (AEM) of the Central Facility EBBR froze up with ice and stopped working (surmised from looking at the EBBR1 data). This caused a fuse to blow and stop the mechanism from operating. However, one channel of the CR10 data logger was apparently damaged in the process. The condition of the AEM only, was noticed on 4 January 1993 by site operations personnel. The blown fuse was replaced, which started the AEM working; but AEM home signal values between 30 Dec and 04 Jan were around zero. Home values remained around zero until at least January 8, 1993. I have a gap in data archived at ANL between 8 and 15 January 1993, during which I do not know quite what was happening. On 11 January 1993 site operations personnel found that the EBBR1 battery was run down and the EBBR thus was not working. A new battery was installed. On 15 January the home values were about 34. I am assuming that they became 34 upon installation of the new battery on 11 January. Until at least 15 January the home signals stayed around 34. After that period the home signals became greater than 35 and generally were around 36. Only occasionally (a few hours here and there)were the home signals just above or below 35 to produce the proper flux outputs. On 23 April 1993, at my direction (and after a week of tests on other parts of the system), the CR10 data logger was replaced. This solved the problem. In fact, previous to this I had suggested reloading the software into the previous CR10, but the CR10 would not accept it; as soon as the machine was deactivated before that procedure it stopped working altogether. I find it amazing that it worked at all, although all data other than the home signals, and the calculated quantities dependent on them looked perfectly acceptable during the period of interest; there is no evidence that the CR10 was malfunctioning in other areas. The road to restoring the 30 Dec to 23 April data would be a rocky one, as each 15 minute data period would have to be examined to determine the proper position of the sensors on the AEM. However, it is possible to reconstruct most of the 30 minute calculated values from the 15 minute data. |
Measurements: | sgp5ebbrE13.a0:
sgp30ebbrE13.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
07/06/1993 | 0631 | 07/06/1993 | 0632 |
Subject: | EBBR - soil heat flux plate giving opposite sign |
DataStreams: | sgp30ebbrE20.a1, sgp5ebbrE20.a0 |
Description: | EDITOR'S NOTE: This DQR refers to data collected by the EBBR at E20 prior to the begin date of regular ARM data. At that time, the data streams which contain the EBBR.E20 data were named Dsgp15ebbr6.a0 Dsgp30ebbr6.a1 Dsgp5ebbr6.a0 These data are not readily available from the ARM archive, but can be made available by special request. The actual time range of the problem described here is 930405.0000-930429.2359. Soil heat flux sensor #3 of EBBR6, at Meeker, Ok extended site was determined by me to have one heat flux plate whose output was out of phase with the other four. The absolute value of the soil heat flux value produced by the plate was good. Normally, this condition is caused either by improper wiring of the sensor into the data acquisition system (this was checked by site operations personnel on 29 April; wiring convention was correct) or by the plate being installed upside down. The latter seems fairly obvious, although the plate was not dug up to check it's orientation; that is not neccesary and would be detrimental since it takes time for such sensors to acclimate themselves to their soil environment. The consequence of this problem is that 5 soil heat flux plate outputs were being averaged, with one of the outputs being of opposite sign from the other four. Since the outputs are similar, in absolute terms, this essentially resulted in an average soil heat flux plate value that is 40% too low. In terms of output, this a reduction of around 10 W per meters squared, or 1-2% of the RN+G term during maximum solar insolation. This is clearly a small error. Site operations personnel switched the soil heat flux plate leads to give the proper sign of output, on 29 April 1993, time unknown (this can be determined from looking at the ingested data later; it hasn't been ingested yet). The instrument operated properly at that point. Thus, the problem has been corrected. |
Measurements: | sgp30ebbrE20.a1:
sgp5ebbrE20.a0:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
07/13/1993 | 1201 | 07/13/1993 | 1202 |
Subject: | SGP/EBBR/E13 - incorrect meteorological observations |
DataStreams: | sgp30ebbrE13.a1, sgp5ebbrE13.a0 |
Description: | EDITOR'S NOTE: This DQR refers ti data collected by the EBBR at E13 prior to the begin date of regular ARM data. At that time, the data streams which contain the EBBR.E13 data were named Dsgp15ebbr1.a0 Dsgp30ebbr1.a1 Dsgp5ebbr1.a0 These data are not readily available from the ARM archive, but can be made available by special request. The actual time range of the problem described here is 930417.1200-930422.1730. Beginning at 1200 UTC on 17 April 1993, EBBR1, Central Facility, outputs ramped to extreme values, some positive, some negative. These outputs ended their ramping approximately 3 hours later. Comparison with SMOS data indicate that no time averaged outputs from EBBR1 were consistent with the SMOS after 1200 UTC. It appears that the averaging instruction in the CR10 data logger had been corrupted. On 22 April site operations, at my request, tried to reenter the software; this attempt was completely unsuccessful, indicating that the CR10 probably had other problems as well. EBBR1 was offline from 1730 UTC on 22 April until 1400 UTC on 23 April, when a new CR10 was installed and the software downloaded successfully. Since a SDS utility for extracting real time data from the CF SMOS had not been established, EBBR1 was being used for weather observations. All EBBR1 measurements of meteorological quantities during the period above are invalid. |
Measurements: | sgp5ebbrE13.a0:
sgp30ebbrE13.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
07/13/1993 | 1200 | 11/02/1993 | 2121 |
Subject: | SGP/EBBR/E13 - pressure calibration |
DataStreams: | sgp30ebbrE13.a1 |
Description: | In the original Campbell CR10 software provided by the vendor (version 1), the EBBR had incorrect calibration pressure sensor slopes and offsets. The slopes and offset was carried through into version 2 of the software and was not discovered by the mentor (me) until sometime later. The calibration and slope did not deleteriously affect calculations in the program since only a four percent reduction in atmospheric pressure measurement resulted (the calculations are not very sensitive to small errors in pressure). The vendor does not recall how the wrong calibrations came to be used. Version 4 of the CR10 program includes the proper calibration and offset. This remedies the apparent offset problem (it was actually a calibration and offset problem). In comparisons with the co-located SMOS pressure sensor, the difference between the SMOS and EBBR pressure values appeared almost constant with time, hence the assumption of an offset problem. However, the EBBR pressure sensor offsets are so large (a consequence of tailoring the calibration curve to a small range of elevations in which the calibration applies) that the very small error in slope was difficult to recognize. The outputted pressure values for the EBBR system can be corrected with the following information and equations. Old Slope Old Offset New Slope New Offset 0.01952 81.24 0.02031 81.27 Correct Pressure = ((Current Pressure Data - 81.24)*0.02031/0.01952) + 81.27 = 1.04047*(Current Pressure Data) - 3.258 |
Measurements: | sgp30ebbrE13.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
07/13/1993 | 1200 | 11/02/1993 | 2121 |
Subject: | SGP/EBBR/E13 - solid moisture correction |
DataStreams: | sgp30ebbrE13.a1 |
Description: | In the original EBBR software (Version 1) for the Campbell CR10 at the Central Facility (E13), adjustment of the soil moisture for soil type was performed differently than for the other EBBR systems. This was supposed to have been changed prior to installation (according to the vendor), but the change was not made. This adjustment was carried into Version 2 and was not discovered by the mentor (me) until later. A polynomial is used to adjust the measured soil moisture for differences between the soil type at the location of installation (clay-loam assumed) and the soil type (sand) used in the calibration of the soil moisture sensor. The adjustment in the E13 EBBR only, was computed on the basis of a sandy-loam soil. Presently, a clay-loam soil type is assumed for each EBBR location. Soil types at the extended facilities have not been characterized yet, although there are hopes of doing so in the future. The effect of using a polynomial for sandy-loam soil instead of clay-loam soil is to decrease the resultant soil moisture values by approximately 14.5% when the clay-loam polynomial would indicate a soil moisture of 28.3%, and by approximately 38.3% when the clay-loam polynomial would indicate a soil moisture of 6.3%. The normal range of soil moisture at the EBBR sites is approximately 3% to 35%. The effect of the soil moisture decreases above on the adjustment to soil heat flux plate measurements is less than 1.0%. The effect on the change in energy storage in the soil (determined from the change in soil temperature over time) is a 10% decrease for a soil moisture of 28.3% and a decrease of 13.0% for a soil moisture of 6.3%. The change in energy storage is typically 5% of the total surface energy budget during mid-day and 25% at night. Therefore, the soil type adjustment error in the Central Facility EBBR resulted in approximately a 0.5% error in the surface energy budget during mid-day and 2.5% at night. These are small and acceptable errors and should not cause one to need to recalculate energy budget values. |
Measurements: | sgp30ebbrE13.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
10/23/1993 | 0100 | 10/23/1993 | 0330 |
10/23/1993 | 1830 | 10/24/1993 | 0000 |
10/24/1993 | 1430 | 10/24/1993 | 1930 |
10/24/1993 | 2200 | 10/25/1993 | 0500 |
10/25/1993 | 0700 | 10/25/1993 | 0800 |
10/25/1993 | 1630 | 10/25/1993 | 2100 |
10/25/1993 | 2300 | 10/27/1993 | 0600 |
10/27/1993 | 1200 | 10/27/1993 | 1300 |
10/27/1993 | 1630 | 10/27/1993 | 1730 |
10/27/1993 | 1830 | 10/28/1993 | 0100 |
10/28/1993 | 1530 | 10/29/1993 | 0830 |
10/31/1993 | 0430 | 10/31/1993 | 0830 |
10/31/1993 | 1030 | 10/31/1993 | 1600 |
10/31/1993 | 1700 | 11/01/1993 | 0030 |
11/01/1993 | 0130 | 11/01/1993 | 0630 |
11/01/1993 | 1700 | 11/04/1993 | 0230 |
11/04/1993 | 0700 | 11/04/1993 | 1830 |
Subject: | SGP/EBBR/E4 - Reprocess: Intermittently bad soil heat flux sensor #4 |
DataStreams: | sgp15ebbrE4.a0, sgp30ebbrE4.a1 |
Description: | On October 23, 1993 soil heat flux sensor #4 (which had been installed on September 23, 1993) of the Plevna, KS EBBR (E4) developed an intermittent poor electrical contact with the multiplexer. Corrupted 30 minute values of shf4, c_shf4, g4, ave_shf, h, and e, and corrupted 15 minute values of mv_hft4 resulted from this situation. The quantities shf4, c_shf4, g4, and mv_hft4 are bad data values and are not recoverable. The other quantities can be recalculated using the three functioning sets of soil sensors. (Note: Soil heat flux sensor #5 was also malfunctioning during the time periods identified and has therefore been eliminated from the recalculation equations. This problem is identified in a separate DQR.) ave_shf = (g1 + g2 + g3)/3 e = -(q + ave_shf)/(1 + bowen) h = -(e + ave_shf + q) |
Measurements: | sgp30ebbrE4.a1:
sgp15ebbrE4.a0:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
07/11/1993 | 0300 | 11/01/1993 | 1700 |
Subject: | SGP/EBBR/E9 - pressure calibration |
DataStreams: | sgp30ebbrE9.a1 |
Description: | In the original Campbell CR10 software provided by the vendor (version 1), the EBBR had incorrect calibration pressure sensor slopes and offsets. The slopes and offset was carried through into version 2 of the software and was not discovered by the mentor (me) until sometime later. The calibration and slope did not deleteriously affect calculations in the program since only a four percent reduction in atmospheric pressure measurement resulted (the calculations are not very sensitive to small errors in pressure). The vendor does not recall how the wrong calibrations came to be used. Version 4 of the CR10 program includes the proper calibration and offset. This remedies the apparent offset problem (it was actually a calibration and offset problem). In comparisons with the co-located SMOS pressure sensor, the difference between the SMOS and EBBR pressure values appeared almost constant with time, hence the assumption of an offset problem. However, the EBBR pressure sensor offsets are so large (a consequence of tailoring the calibration curve to a small range of elevations in which the calibration applies) that the very small error in slope was difficult to recognize. The outputted pressure values for the EBBR system can be corrected with the following information and equations. Old Slope Old Offset New Slope New Offset 0.01952 81.24 0.02031 81.27 Correct Pressure = ((Current Pressure Data - 81.24)*0.02031/0.01952) + 81.27 = 1.04047*(Current Pressure Data) - 3.258 |
Measurements: | sgp30ebbrE9.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
08/29/1993 | 0000 | 08/29/1993 | 2359 |
09/02/1993 | 0000 | 09/03/1993 | 2359 |
09/06/1993 | 0000 | 09/08/1993 | 2359 |
09/10/1993 | 0000 | 09/16/1993 | 2359 |
09/18/1993 | 0000 | 09/29/1993 | 2359 |
10/01/1993 | 0000 | 10/11/1993 | 2359 |
10/13/1993 | 0000 | 10/31/1993 | 2359 |
11/01/1993 | 0000 | 11/04/1993 | 2359 |
Subject: | SGP/EBBR/E4 - AEM malfunction |
DataStreams: | sgp15ebbrE4.a0, sgp30ebbrE4.a1, sgp5ebbrE4.a0 |
Description: | Beginning when the E4, Plevna EBBR was moved to a different location in the same area on August 29, 1993, the home_15 signal began to malfunction intermittently. The home_15 signal is normally between 45 and 53; in the case where it malfunctions, it reads approximately 22. The home signal is sampled only once per fifteen minute period to indicate the position of the Automatic Exchange Mechanism (AEM). However, the realtime value is used every 30 seconds to determine the sign of the gradient of temperature and relative humidity. Clearly, the 15 minute sample may not always reflect the proper position if something is wrong with the AEM. Therefore, when the home_15 signal is incorrect for a half hour, it is wise to view the preceding and successive half hours of data with suspicion as well as the half hour of interest. Affected data are 5 minute values of mv_home; 15 values of tair_top, tair_bot, thum_top, thum_bot, hum_top, hum_bot, vp_top, vp_bot, and home; 30 minute values of tair_top, tair_bot, thum_top, thum_bot, hum_top, hum_bot, vp_top, vp_bot, bowen, e, h, and home_15. The dates on which this problem occurred were (all 1993) August 29, September 2, 3, 6-8, 10-16, 18-29, October 1-11, 13-31, and November 1-4. On November 4, 1993 the AEM was replaced at Plevna, correcting the problem described in this PIF. |
Measurements: | sgp5ebbrE4.a0:
sgp30ebbrE4.a1:
sgp15ebbrE4.a0:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
09/22/1993 | 1630 | 11/03/1993 | 1730 |
Subject: | SGP/EBBR/E8 - Drop in atmospheric pressure |
DataStreams: | sgp15ebbrE8.a0, sgp30ebbrE8.a1, sgp5ebbrE8.a0 |
Description: | Beginning September 22, 1993, the atmospheric pressure sensor at the E8 EBBR began showing drops of as much as 5 kPa for about half a day. These could be easily seen in comparisons with the SMOS pressure sensor. The drops were diurnal and occurred during daytime, at the same time as other quantities such as temperature, net radiation, and battery voltage were at the highest levels of the day. It is unclear what exactly caused this situation. Replacement of the Campbell multiplexer to which the pressure sensor was connected caused the problem to go away. The same multiplexer was then used as a replacement for the other multiplexer in the E8 EBBR and has not shown any odd behavior on the channel that previously served the pressure sensor. My conclusion is that there was poor electronic contact of the pressure sensor to the multiplexer. Affected pressure data can only be easily seen by comparison with SMOS pressure data. No EBBR data other than pressure is affected by the pressure problem; calculations of specific heat at constant pressure (which includes the term 1/(p-vp)) times other terms (including p-.378*vp) result in a very small error in the resulting Bowen Ratio. For example; assume a common vapor pressure (vp) of 2.0 kPa, a common atmospheric pressure of 97.0 kPa, and a corrupted atmospheric pressure of 92.0 kPa. Uncorrupted Corrupted (97.0-.378*2.0)/(97.0-2.0) = 1.0131 (92.0-.378*2.0)/(92.0-2.0) = 1.0138 1.0138/1.0131 = 1.00069 or 0.069% increase in the Bowen Ratio as a result of the corruption Therefore, no correction to the quantities calculated using pressure is warranted. |
Measurements: | sgp5ebbrE8.a0:
sgp15ebbrE8.a0:
sgp30ebbrE8.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
07/11/1993 | 1100 | 12/01/1993 | 1830 |
Subject: | Incorrect readings for pressure sensor |
DataStreams: | sgp15ebbrE15.a1, sgp30ebbrE15.a1, sgp5ebbrE15.a0 |
Description: | ARM PROBLEM IDENTIFICATION FORM (PIF) PIF No. P940105.1 Subject: SGP/Ebbr - Incorrect readings for pressure sensor at E15 Submitted By: David R. Cook Organization: Argonne National Laboratory Date Submitted: December 13, 1993 How may we contact you? e-mail: cook@anler.er.anl.gov phone: (708) 252-5840 FAX: (708) 252-9792 Submitter's Priority: 3 [Critical-1 Very Important-2 Important-3 Inconvenient-4 Interesting-5] Where was this Problem Identified: DA [Site Data System-SDS Experiment Center-EC] [Archive-A At Field Instrument-FI ] [During Data Analyis-DA Other- List Location] Does this PIF result in a Software Change Request? No Where: [ SDS, EC, or A ] Type: [Development-1 Problem-2 Enhancement-3] List Programs/Documents Affected: Configuration Identification: Does problem impact data values or cause data loss? Data values. which platform(s): EBBR, E15, Ringwood, OK Specify (or estimate) begin and end dates Begin Date 7/11/93 End Date 12/01/93 Time 1830 GMT Apparent cause of data loss, if known: SUGGESTED CAUSES: Calibration Drift. [human error, component failure, temperature, lightning ] [foreign matter, power loss, software failure, ] [communications failure, modification difficulites, specify other] Problem Description/Change Description. o For Instrument Problems ONLY, Identify MODE of Operation: Normal o Give a brief explanation with details, attach examples and any supporting information. This should include a description of analysis leading to identification of problem and, if known, recommended action. Beginning July 11, 1993, the atmospheric pressure sensor at the E15 EBBR began indicating approximately 0.2 KPa lower than the colocated SMOS. Between July 31 and August 22, 1993 the difference increased to between 0.25 and 0.30 KPa. After August 22, the difference increased to 0.3 to 0.35 KPa and remained that way until December 1, 1993. A comparison of the EBBR pressure sensor with the portable standard on December 1, 1993 indicated that the EBBR sensor was 0.04 KPa higher than the standard; this is excellent agreement considering that the uncertainty of the EBBR sensor calibration is 0.15 KPa. The consistent bias in EBBR pressure between July 11 and December 1 can be easily detected in comparisons with SMOS pressure data. No EBBR data other than pressure was affected by the pressure problem; calculations of specific heat at constant pressure (which includes the term 1/(p-vp)) times other terms (including p-.378*vp) result in no error to the third decimal point at least in the resulting Bowen Ratio. For example; assume a common vapor pressure (vp) of 2.0 kPa, a common atmospheric pressure of 97.0 kPa, and a corrupted atmospheric pressure of 96.65 kPa at the extreme. Uncorrupted Corrupted (97.0-.378*2.0)/(97.0-2.0) = 1.0131 (96.65-.378*2.0)/(96.65-2.0) = 1.0131 1.0131/1.0131 = 1.0000 There is no effect on the Bowen Ratio as a result of the corruption. Therefore, no correction to the quantities calculated using pressure is needed. |
Measurements: | sgp5ebbrE15.a0:
sgp30ebbrE15.a1:
sgp15ebbrE15.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
12/01/1993 | 0000 | 12/21/1993 | 1800 |
Subject: | SGP/EBBR/E22 - Air Temperature Sensor malfunction |
DataStreams: | sgp15ebbrE22.a1, sgp30ebbrE22.a1, sgp5ebbrE22.a0 |
Description: | The right air temperature probe (thermocouple) malfunctioned during the periods stated above at Cordell, OK (E22). It was replaced on December 21, 1993 and good data began again with the 1830 GMT half hour average. For the periods of interest, 5 and 30 minute values of tair_top and tair_bot are incorrect when the right probe was in the specified position; 15 minute values of tair_r are incorrect; and 30 minute values of bowen, e, and h are incorrect. None of these values are recoverable or recalculatable through the use of other quantities since both air temperature probes are needed to determine bowen ratio. |
Measurements: | sgp30ebbrE22.a1:
sgp15ebbrE22.a1:
sgp5ebbrE22.a0:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
10/30/1993 | 1300 | 11/12/1993 | 1600 |
Subject: | SGP/EBBR/E20 - Blown fuse in AEM at E20 |
DataStreams: | sgp15ebbrE20.a0, sgp30ebbrE20.a1, sgp5ebbrE20.a0 |
Description: | On October 30, 1993, before 1300 GMT, the fuse in the AEM (Automatic Exchange Mechanism) of Meeker, Ok (E20) EBBR blew out. The AEM remained nonfunctional until the fuse was replaced just before 1600 GMT on November 12, 1993. This situation resulted in the following invalid data: 5 minute: tair_top, tair_bot, thum_top, thum_bot, hum_top, hum_bot, vp_top, vp_bot, home 15 minute: rr_thum_r, rr_thum_l, mv_hum_r, mv_hum_l, mv_home, tair_r, tair_l 30 minute: tair_top, tair_bot, thum_top, thum_bot, hum_top, hum_bot, vp_top, vp_bot, bowen, e, h, home_15, home_30 If the biases of the sensors were know, bowen, h, and e could be recalculated from the 15 minute and/or 5 minute data. Since we will not have any idea of what those biases are until an annual calibration of the sensors can take place (which may be months away), the recalculations cannot be performed at this time. Furthermore, it may be invalid to use sensor biases, if determined too far removed in time, due to the gradual calibration drift of some of the sensors. |
Measurements: | sgp15ebbrE20.a0:
sgp30ebbrE20.a1:
sgp5ebbrE20.a0:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
11/12/1993 | 0300 | 11/15/1993 | 1830 |
Subject: | SGP/EBBR/E15 - Questionable data due to low voltage at E15 |
DataStreams: | sgp15ebbrE15.a0, sgp30ebbrE15.a1, sgp5ebbrE15.a0 |
Description: | On November 11, 1993 at 0300 GMT the voltage level of the battery for the EBBR at Ringwood (E15) dropped to too low a level for most of the sensors to perform properly. By 0700 GMT virtually all sensors were not indicating properly. This condition continued through 1830 GMT on November 15, 1993. No data from this EBBR should be considered valid during the period indicated, since the quality of data from all sensors is questionable. |
Measurements: | sgp15ebbrE15.a0:
sgp5ebbrE15.a0:
sgp30ebbrE15.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
11/09/1993 | 1700 | 11/22/1993 | 1700 |
Subject: | SGP/EBBR/E22 - Incorrect averaging interval at E22 |
DataStreams: | sgp30ebbrE22.a1 |
Description: | On November 9, 1993 version 4 of the EBBR program installed at Cordell, OK (E22) was mistakenly modified in one area during the process of modifying a calibration in another part of the program. The mistaken modification was a change in the execution interval from 30 seconds to 10 seconds. This modification remained in the program until November 22, 1993 when it was discovered and changed back to a 30 second execution interval. The modification produced no ill effects as the execution interval only changes sampling and averaging periods. A 10 second execution interval results in three times as many samples being taken, which, when averaged, should actually produce more accurate results. Therefore, data quality was not affected. This PIF was written only to document the fact that the mistaken modification was made, and when it was made. |
Measurements: | sgp30ebbrE22.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
11/24/1993 | 1215 | 11/24/1993 | 1515 |
Subject: | SGP/EBBR/E20 - Reprocess: Questionable data in soil heat fluxes at E20 |
DataStreams: | sgp15ebbrE20.a0, sgp30ebbrE20.a1 |
Description: | Soil heat flux probes #4 had been indicating soil heat fluxes that were higher than the other four probes. It was decided to replace it. On November 24, 1993 Soil Heat Flux probe #4 was replaced, resulting in outputs more similar to the other four probes. This PIF does not invalidate previous measurements by the old probe #4, but only indicates data that is bad as a result of the replacement procedure. This procedure resulted in some bad data for the adjoining soil heat flux probes #3 and #5 also. Bad data for #3 includes the 1600 GMT half hour, and 5 and 15 minute periods between 1530 and 1600 GMT. Bad data for #4 includes half hour times of 1600 through 1900 GMT, with 5 and 15 minute data inbetween those times being invalid as well. Bad data for #5 includes half hour times of 1630 and 1700 GMT, with 5 and 15 minute periods inbetween those times being invalid as well. Corrupted 30 minute values of shf4, c_shf4, g4, ave_shf, h, and e, and corrupted 15 minute values of mv_hft4 resulted. The quantities shf4, c_shf4, g4, and mv_hft4 are bad data values and are not recoverable. The other quantities can be recalculated using the remaining functioning set(s) of soil sensors. Use the following equations: ave_shf = (gs summed)/n, where n is the number of probes functioning e = -(q + ave_shf)/(1 + bowen) where q is net radiation, and bowen is Bowen Ratio h = e * bowen |
Measurements: | sgp15ebbrE20.a0:
sgp30ebbrE20.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
12/17/1993 | 1100 | 12/29/1993 | 1700 |
Subject: | SGP/EBBR/E8 - Invalid data due to AEM fuse blow out at E8 |
DataStreams: | sgp15ebbrE8.a1, sgp30ebbrE8.a1, sgp5ebbrE8.a0 |
Description: | On December 17, 1993, before 1100 GMT, the fuse in the AEM (Automatic Exchange Mechanism) of Coldwater, KS (E8) EBBR blew out. The AEM remained nonfunctional until the fuse was replaced just before 1700 GMT on December 29, 1993. During the 1000 GMT half hour on December 17 the AEM was hung up; this is clear from the home signal. These situations resulted in the following invalid data: 5 minute: tair_top, tair_bot, thum_top, thum_bot, hum_top, hum_bot, vp_top, vp_bot, home 15 minute: rr_thum_r, rr_thum_l, mv_hum_r, mv_hum_l, mv_home, tair_r, tair_l 30 minute: tair_top, tair_bot, thum_top, thum_bot, hum_top, hum_bot, vp_top, vp_bot, bowen, e, h, home_15, home_30 Bowen, h, and e can not be recalculated from the 15 minute and/or 5 minute data since we cannot determine the position of the sensors on the AEM from the home signal; home signal is near zero when there is no power to the AEM. |
Measurements: | sgp15ebbrE8.a1:
sgp5ebbrE8.a0:
sgp30ebbrE8.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
12/20/1993 | 0730 | 12/22/1993 | 1500 |
Subject: | SGP/EBBR/E12 - Invalid data due to blown AEM fuse at E12 |
DataStreams: | sgp15ebbrE12.a1, sgp30ebbrE12.a1, sgp5ebbrE12.a0 |
Description: | On December 20, 1993, before 0730 GMT, the fuse in the AEM (Automatic Exchange Mechanism) of Pawhuska, OK (E12) EBBR blew out. The AEM remained nonfunctional until the fuse was replaced just before 1500 GMT on December 22, 1993. This situation resulted in the following invalid data: 5 minute: tair_top, tair_bot, thum_top, thum_bot, hum_top, hum_bot, vp_top, vp_bot, home 15 minute: rr_thum_r, rr_thum_l, mv_hum_r, mv_hum_l, mv_home, tair_r, tair_l 30 minute: tair_top, tair_bot, thum_top, thum_bot, hum_top, hum_bot, vp_top, vp_bot, bowen, e, h, home_15, home_30 Bowen, h, and e can not be recalculated from the 15 minute and/or 5 minute data since we cannot determine the position of the sensors on the AEM from the home signal; home signal is near zero when there is no power to the AEM. |
Measurements: | sgp5ebbrE12.a0:
sgp30ebbrE12.a1:
sgp15ebbrE12.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
12/16/1993 | 1630 | 12/16/1993 | 1700 |
Subject: | SGP/EBBR/E4 - Invalid data during E4 battery exchange |
DataStreams: | sgp15ebbrE4.a1, sgp30ebbrE4.a1, sgp5ebbrE4.a0 |
Description: | On December 16, 1993 the battery for the EBBR at Plevna, KS (E4) was replaced. This invalidates all 5, 15 and 30 minute data for the half hour concluding at 1700 GMT. |
Measurements: | sgp5ebbrE4.a0:
sgp15ebbrE4.a1:
sgp30ebbrE4.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
12/16/1993 | 2100 | 12/16/1993 | 2130 |
Subject: | SGP/EBBR/E4 - Invalid data due to AEM not exchanging |
DataStreams: | sgp30ebbrE4.a1 |
Description: | The AEM didn't exchange during the half hour ending 2130 GMT on December 16, 1993. This invalidates the half hour values of bowen, e, and h. We do not know the biases of the temperature and relative humidity sensors and thus should not recalculate bowen, e, and h from the 5 and/or 15 minute data between 2100 and 2130 GMT. |
Measurements: | sgp30ebbrE4.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
12/31/1993 | 1950 | 12/31/1993 | 2100 |
Subject: | SGP/EBBR/E13 - Invalid data during disconnection of AEM at E13 |
DataStreams: | sgp15ebbrE13.a1, sgp30ebbrE13.a1, sgp5ebbrE13.a0 |
Description: | On December 31, 1993 at 1950 GMT the AEM on the Central Facility EBBR was disconnected. Another AEM was then connected, on which some testing was needed before site operations could be confident that it was ready for field installation at an extended facility. At 2041 GMT the original AEM was reconnected. The following 5, 15, and 30 minute data between or for the stated times below is invalid: 5 minute (1950 to 2045 GMT): tair_top, tair_bot, thum_top, thum_bot, hum_top, hum_bot, vp_top, vp_bot, home 15 minute (2000 to 2045 GMT): rr_thum_r, rr_thum_l, mv_hum_r, mv_hum_l, mv_home, tair_r, tair_l 30 minute (2000 through 2100 GMT): tair_top, tair_bot, thum_top, thum_bot, hum_top, hum_bot, vp_top, vp_bot, bowen, e, h, home_15, home_30 |
Measurements: | sgp5ebbrE13.a0:
sgp15ebbrE13.a1:
sgp30ebbrE13.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
01/12/1994 | 1100 | 01/12/1994 | 1630 |
Subject: | SGP/EBBR/E8 - Invalid wind data frozen sensor |
DataStreams: | sgp15ebbrE8.a1, sgp30ebbrE8.a1, sgp5ebbrE8.a0 |
Description: | On January 12, 1994 the EBBR wind speed sensor at E8, Coldwater, KS was frozen to a stationary by ice. Invalid data for the time period 1100 to 1630 GMT is: 30 minute: wind_s, res_ws 15 minute: wind_s 5 minute: wind_s, res_ws. |
Measurements: | sgp15ebbrE8.a1:
sgp5ebbrE8.a0:
sgp30ebbrE8.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
02/10/1994 | 1630 | 02/10/1994 | 1700 |
Subject: | SGP/EBBR/E4 - Invalid data during shutdown for PM on 2/10/94 |
DataStreams: | sgp15ebbrE4.a1, sgp30ebbrE4.a1, sgp5ebbrE4.a0 |
Description: | During a preventative maintenance visit on February 10, 1994, a modification to a calibration in the EBBR CR10 program required the system to be down for a short time. All data between 1630 and 1700 GMT on that day is invalid. |
Measurements: | sgp5ebbrE4.a0:
sgp15ebbrE4.a1:
sgp30ebbrE4.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
02/21/1994 | 2330 | 02/23/1994 | 1800 |
Subject: | SGP/EBBR/E8 - Invalid wind speed frozen sensor |
DataStreams: | sgp15ebbrE8.a1, sgp30ebbrE8.a1, sgp5ebbrE8.a0 |
Description: | On February 21, 1994 the EBBR wind speed sensor at E8, Coldwater, KS was frozen to a stationary condition by ice. Invalid data for the time period indicated is: 30 minute: wind_s, res_ws 15 minute: wind_s 5 minute: wind_s, res_ws. |
Measurements: | sgp15ebbrE8.a1:
sgp5ebbrE8.a0:
sgp30ebbrE8.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
02/23/1994 | 1030 | 02/24/1994 | 1540 |
Subject: | Invalid wind speed frozen sensor |
DataStreams: | sgp15ebbrE7.a1, sgp30ebbrE7.a1, sgp5ebbrE7.a0 |
Description: | ARM PROBLEM IDENTIFICATION FORM (PIF) PIF No. P940301.4 Submitted By: David R. Cook Organization: Argonne National Laboratory Date Submitted: March 1, 1994 Problem Description/Change Description. o For Instrument Problems ONLY, Identify MODE of Operation: Degraded o Give a brief explanation with details, attach examples and any supporting information. This should include a description of analysis leading to identification of problem and, if known, recommended action. This is an informational PIF. On February 23, 1994 the EBBR wind speed sensor at E7, Elk Falls, KS was frozen to a stationary condition by ice. Invalid data for the time period indicated is: 30 minute: wind_s, res_ws 15 minute: wind_s 5 minute: wind_s, res_ws. How may we contact you? e-mail: cook@anler.er.anl.gov phone: (708) 252-5840 FAX: (708) 252-9792 Submitter's Priority: 3 [Critical-1 Very Important-2 Important-3 Inconvenient-4 Interesting-5] Where was this Problem Identified: FI [Site Data System-SDS Experiment Center-EC] [Archive-A At Field Instrument-FI ] [During Data Analyis-DA Other- List Location] Does this PIF result in a Software Change Request? NO Where: [ SDS, EC, or A ] Type: [Development-1 Problem-2 Enhancement-3] List Programs/Documents Affected: Configuration Identification: Does problem impact data values or cause data loss? Data Loss. which platform(s): EBBR, E7, Elk Falls, KS Specify (or estimate) begin and end dates for data loss Begin Date 2/23/94 Time 1030 GMT End Date 2/23/94 Time 1540 GMT Apparent cause of data loss, if known: Ice SUGGESTED CAUSES: [human error, component failure, temperature, lightning ] [foreign matter, power loss, software failure, ] [communications failure, modification difficulites, specify other] |
Measurements: | sgp30ebbrE7.a1:
sgp15ebbrE7.a1:
sgp5ebbrE7.a0:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
02/22/1994 | 0615 | 02/23/1994 | 1945 |
Subject: | SGP/EBBR/E4 - Invalid wind speed frozen sensor |
DataStreams: | sgp15ebbrE4.a1, sgp30ebbrE4.a1, sgp5ebbrE4.a0 |
Description: | On February 22, 1994 the EBBR wind speed sensor at E4, Plevna, KS was frozen to a stationary condition by ice. It broke free in a strong wind on February 23, 1994. Invalid data for the time period indicated is: 30 minute: wind_s, res_ws 15 minute: wind_s 5 minute: wind_s, res_ws. |
Measurements: | sgp5ebbrE4.a0:
sgp15ebbrE4.a1:
sgp30ebbrE4.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
02/23/1994 | 0400 | 02/24/1994 | 1300 |
Subject: | SGP/EBBR/E9 - Invalid wind speed frozen sensor |
DataStreams: | sgp15ebbrE9.a1, sgp30ebbrE9.a1, sgp5ebbrE9.a0 |
Description: | On February 23, 1994 the EBBR wind speed sensor at E9, Ashton, KS was frozen to a stationary condition by ice. It broke free in strong winds on February 24, 1994. Invalid data for the time period indicated is: 30 minute: wind_s, res_ws 15 minute: wind_s 5 minute: wind_s, res_ws. |
Measurements: | sgp5ebbrE9.a0:
sgp15ebbrE9.a1:
sgp30ebbrE9.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
03/17/1994 | 1600 | 03/17/1994 | 1630 |
Subject: | SGP/EBBR/E20 - Pressure Sensor Malfunction |
DataStreams: | sgp15ebbrE20.a1, sgp30ebbrE20.a1, sgp5ebbrE20.a0 |
Description: | Pressure sensor malfunction during attempt to monitor it during Preventative Maintenance visit. 30 minute values of pressure for 1600 GMT and 1630 GMT, 15 minute values for 1600, 1615, and 1630, and 5 minute values for 1600, 1605, 1610, 1615, 1620, 1625, and 1630 GMT are incorrect. However, the range of the incorrect values was such as to not adversely affect flux measurements. Some noise was apparently induced in the pressure output voltage as a result of the monitoring, although it is not known how. |
Measurements: | sgp30ebbrE20.a1:
sgp5ebbrE20.a0:
sgp15ebbrE20.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
07/11/1993 | 1501 | 03/22/1994 | 1643 |
Subject: | SGP/E9/EBBR - AEM Malfunction |
DataStreams: | sgp30ebbrE9.a1, sgp5ebbrE9.a0 |
Description: | EDITOR'S NOTE: This DQR refers, in part, to data collected prior to the begin date of regular ARM data. During the first month covered by this DQR, the EBBR.E9 data were not archived with standard ARM names. The data are therefore not readily available, but can be made available by special request. The total period covered by the problem documented here is 930615.0000-940322.1643. The AEM at E9 frequently did not function properly during the time period stated. Please see the notes in the EBBR platform describing home signal conditions for which certain of the data fields are suspect. The newly installed AEM is performing properly so far. The files could be flagged, but it is up to the user to read the platform notes concerning the condition of the home signal and then view the quality of the data accordingly. I would be at my terminal full- time in attempting to list all days and times and data fields that are affected by the numerous AEM malfunctions. Furthermore, I have done so previously in several PIFs that I will reference here for information: P931101.4, P931115.2, P940105.2, P940211.3 |
Measurements: | sgp5ebbrE9.a0:
sgp30ebbrE9.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
03/10/1994 | 1613 | 03/24/1994 | 1810 |
Subject: | SGP/EBBR/E4 - Improper Net Radiometer Calibration |
DataStreams: | sgp15ebbrE4.a1, sgp30ebbrE4.a1, sgp5ebbrE4.a0 |
Description: | When a replacement net radiometer was installed on March 10, 1994, the calibration sheet for the new sensor could not be found. That was because the manufacturer had not provided one with the instrument. So, the calibration for the previous sensor was left in the EBBR CR10 program. I obtained the calibration sheet from the manufacturer, and upon return to Plevna on the next preventative maintenance visit, on March 24, site operations personnel entered the correct calibration into the program. The change in calibration was from 13.1 to 13.0. This change has negligible ( less than one percent) effects on calculations in the program and does not warrant recalculations. However, the net radiation itself could be recalculated by multiplying by the ratio of 13.0 to 13.1. |
Measurements: | sgp5ebbrE4.a0:
sgp15ebbrE4.a1:
sgp30ebbrE4.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
04/05/1994 | 1500 | 04/19/1994 | 1525 |
Subject: | SGP/EBBR/E9 - AEM failure |
DataStreams: | sgp30ebbrE9.a1 |
Description: | The Automatic Exchange Mechanism would not function. It was decided to take the unit back to SGP CART to try to repair it. A spare AEM was not available for a replacement, so the aspirated radiation shields housing temperature and humidity gradient sensors were attached to the EBBR framework, one meter apart vertically, with the right side in the lower position. The housings remained this way for two weeks. During this time period, home signal, sensible heat flux, and latent heat flux values are incorrect. Significant reprocessing would be required to obtain correct fluxes, and that would be possible only if one assumed that offsets in the sensor calibrations are negligible; that is a very debatable assumption considering that the EBBR system is already half a year past due for calibration. |
Measurements: | sgp30ebbrE9.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
05/06/1994 | 1515 | 05/06/1994 | 1600 |
Subject: | SGP/EBBR/E13 - SM4 Replacement |
DataStreams: | sgp15ebbrE13.a1, sgp30ebbrE13.a1 |
Description: | Soil Moisture Probe #4 has been indicating large soil moistures in the past couple of months. At times the values have exceeded the upper limit of the acceptable range. This data could be considered questionable, although the affect on average soil moisture and quantities affected by it is very small. Therefore, I do not suggest additional flagging of the data other than that imposed by the limits. The probe was changed from S/N 92004 to 93004 on May 6, 1994 at 1530 GMT. During the exchange process a few selected periods of soil moisture #4 data is incorrect, but not so different from the other soil moisture probes as to have a significant affect on the average soil moisture or the fluxes. Additionally, the EBBR output was interrupted for a half hour while the calibration of the new probe was entered into the CR10 data logger. Therefore, all 5 minute data from 1535 to 1600 GMT, 15 minute data for 1545 and 1600 GMT, and 30 minute data for 1600 GMT is incorrect. Furthermore, disturbance of the area near the #4 soil probes (temperature, soil moisture, and heat flux) caused all three to be incorrect for the following periods: 30 minute 1530 GMT 15 minute 1515 and 1530 GMT 5 minute 1515, 1520, 1525, and 1530 GMT. Complete recovery by all three sensors did not occur for one day (which is fairly typical for near surface installations), although the differences from the other four sets of soil sensors did not deleteriously affect the averages of the soil quantities. |
Measurements: | sgp15ebbrE13.a1:
sgp30ebbrE13.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
06/02/1994 | 1731 | 06/02/1994 | 1800 |
Subject: | SGP/EBBR/E4 - Soil Heat Flux Plate #5 |
DataStreams: | sgp15ebbrE4.a1, sgp30ebbrE4.a1, sgp5ebbrE4.a0 |
Description: | Soil heat flux plate #5 has indicated high at extremes, for both positive and negative outputs. At around -130 watts per meter squared for #5, the other four heat flux plates indicated approximately half as much. After replacement on June 2, 1994 at 1752 GMT, SHF #5 is now very similar to the other four plates. The effect on average soil heat flux amounted to only about 2% of the net radiation value at the worst; this is within the accuracy of the net radiation measurement and therefore does not require recalculation of the sensible and latent heat fluxes. |
Measurements: | sgp5ebbrE4.a0:
sgp15ebbrE4.a1:
sgp30ebbrE4.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
06/03/1994 | 1200 | 06/08/1994 | 1515 |
Subject: | SGP/EBBR/E12 - Wind Direction |
DataStreams: | sgp15ebbrE12.a1, sgp30ebbrE12.a1, sgp5ebbrE12.a0 |
Description: | For much of the period above, a malfunction in the E12 EBBR wind direction sensor (insect larvae shorting out the circuit board) caused incorrect values for 5 minute res_ws, wind_d, and sigma_wd, 15 minute mv_wind_d, and 30 minute res_ws, wind_d, and sigma_wd. Wind direction normally indicated north (near 0 or 360 degrees); there were some times during the period when wind directions looked good, but the lack of variation in direction and sigma implies that the data is suspect. Therefore, it would be wise to flag all of the values listed above during the entire time period as incorrect. The wind direction sensor (S/N 3081) was replaced with S/N 3042 at 1515 GMT on June 8, 1994. |
Measurements: | sgp5ebbrE12.a0:
sgp30ebbrE12.a1:
sgp15ebbrE12.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
05/06/1994 | 1600 | 06/09/1994 | 1545 |
Subject: | SGP/EBBR/E20 - Soil Moisture Probe |
DataStreams: | sgp15ebbrE20.a1, sgp30ebbrE20.a1 |
Description: | Beginning on May 6, 1994, soil moisture probe #3 began a long decline in output and sensitivity until it stabilized at a low value of around 7, with virtually no sensitivity at midday (GMT) on May 22, 1994. The output remained around this low value until the probe was replaced on June 9, 1994 at 1545 GMT. Old Probe S/N 92038, New Probe S/N 93003. |
Measurements: | sgp30ebbrE20.a1:
sgp15ebbrE20.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
12/03/1993 | 0000 | 06/30/1994 | 1714 |
Subject: | SGP/EBBR/E4 - Pressure |
DataStreams: | sgp15ebbrE4.a1, sgp30ebbrE4.a1, sgp5ebbrE4.a0 |
Description: | Damage to some pressure sensors as a result, apparently, of high battery voltage, caused pressure readings to vary significantly at a few EBBRs for several months. I am being intentionally vague in making that statement as there are DQRs and at least one PIF that cover those cases, except for the situation at E4, Plevna, KS. Some time ago I had the suspect pressure sensors replaced and "repaired". Unfortunately, the repairs were insufficient, as we found out by using Plevna as a guinea pig for the "repaired" sensors to see if they were working. It turns out that the three repaired sensors S/N 6500, 6504, and 6509 were better, but still experienced fluctuations in output that followed battery voltage level as the battery was charged by the solar panel during the daylight hours. The fluctuations look like long-term spikes, positive or negative at different times, and lasted from one to several hours. The fluctuations had minimal impact on adjustments to computed values from the EBBR. Pressure data from Plevna for the period listed above should not be used for absolute values. That is why I marked "questionable", in the data labelling section, but this applies only to the pressure data itself. The following documents the use of pressure sensors at Plevna: 1) The original sensor, S/N 6509 was removed for repair on 1/13/94 and replaced with the "repaired" S/N 6500. 2) S/N 6500 was removed for repair on 2/10/94 and replaced with the "repaired" S/N 6504. 3) S/N 6504 was removed on 3/24/94 and replaced with "repaired" (2nd time) S/N 6500. 4) S/N 6500 was removed on 5/5/94 and replaced with "repaired" (2nd time) S/N 6504. 5) S/N 6504 was removed on 5/19/94 and replaced with "repaired" S/N 6509. 6) S/N 6509 was removed on 6/30/94 and replaced with a new sensor, S/N 6579. Sensors 6500, 6504, and 6509 have been thrown away, as the manufacturer appears to be incapable of repairing them completely. Rather than waste more money in trying to have them repaired, I ordered three new pressure sensors, of which S/N 6579 is one. Thus, we now have two new sensors as spares. |
Measurements: | sgp5ebbrE4.a0:
sgp15ebbrE4.a1:
sgp30ebbrE4.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
06/15/1994 | 2100 | 06/15/1994 | 2130 |
06/15/1994 | 2300 | 06/16/1994 | 0030 |
06/16/1994 | 2130 | 06/17/1994 | 1530 |
06/17/1994 | 1900 | 06/17/1994 | 1930 |
06/18/1994 | 0200 | 06/25/1994 | 1930 |
06/25/1994 | 2300 | 06/28/1994 | 1600 |
Subject: | SGP/EBBR/E9 - Reprocess: Soil Heat Flow Sensor Failure |
DataStreams: | sgp15ebbrE9.a1, sgp30ebbrE9.a1 |
Description: | Failure of soil heat flow sensor #5 at E9, Ashton, KS resulted in incorrect data values for 6 fields for much of the period of time listed above. The soil heat flow values from #5 were so large (in the absolute) that it deleteriosly affected the soil heat flux average and the sensible and latent heat fluxes. The fields affected were: 30 minute: shf5, c_shf5, g5, ave_shf, e, h 15 minute: mv_hft5. I list only the 30 minute times affected below; it can be assumed that the 15 minute value contained in the half hour are incorrect. Sensor #5 was replaced at 1545 GMT on June 28. Old S/N 923029, new S/N 923092. Half hour 1600 GMT is missing due to having to reload the CR10 program with a new shf5 calibration. Sensible and latent heat fluxes can be recomputed by averaging soil heat flow sensors 1-4; use the following equations: ave_shf = (g1 + g2 + g3 + g4)/4 e = -(q +ave_shf)/(1 + bowen) h = e * bowen, where g is total soil heat flow, q is net radiation, and bowen is Bowen Ratio. Affected half hours: Date Times (GMT) 6/15 2130, 2300, 2330 6/16 0000, 0030, 2130-2330 6/17 0000-1530, 1900, 1930 6/18 0200-2330 6/19 All 6/20 All 6/21 All 6/22 All 6/23 All 6/24 All 6/25 0000-1930, 2300, 2330 6/26 All 6/27 All 6/28 0000-1600 |
Measurements: | sgp15ebbrE9.a1:
sgp30ebbrE9.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
06/18/1994 | 2000 | 06/22/1994 | 1600 |
Subject: | SGP/EBBR/E12 - Aspirator Failure |
DataStreams: | sgp15ebbrE12.a1, sgp30ebbrE12.a1, sgp5ebbrE12.a0 |
Description: | On June 18, 1994 the aspirator fan in the EBBR at E12, Pawhuska stopped working. This situation was not discovered until a Preventative Maintenance visit by site operations personnel on June 22, 1994. I determined the time of the beginning of the malfunction from close inspection of the sensible and latent heat flux data. There is no aspiration status output for the EBBRs, nor is one presently possible. Wind speeds during most of the period listed were sufficient to provide some (although inadequate) aspiration to the temperature and relative humidity probes, making it difficult for most users of the data to be able to tell (except in a few circumstances) that the sensible and latent heat flux values produced were incorrect. All of the data fields listed below are incorrect for the period listed above. Latent and Sensible heat fluxes cannot be recomputed, as the measurements that they are based on are what was corrupted. 30 minute: tair_top, tair_bot, thum_top, thum_bot, hum_top, hum_bot, vp_top, vp_bot, bowen, e, h 15 minute: rr_thum_r, rr_thum_l, mv_hum_r, mv_hum_l, tair_r, tair_l 5 minute: tair_top, tair_bot, thum_top, thum_bot, hum_top, hum_bot, vp_top, vp_bot |
Measurements: | sgp5ebbrE12.a0:
sgp30ebbrE12.a1:
sgp15ebbrE12.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
06/28/1994 | 1700 | 06/29/1994 | 1700 |
Subject: | SGP/EBBR/E7 - Reprocess: Soil Temperature Probe Failure |
DataStreams: | sgp15ebbrE7.a1, sgp30ebbrE7.a1 |
Description: | Failure of soil temperature probe #4 at E7, Elk Falls, KS resulted in incorrect data values for 6 fields for the period of time listed above. The soil temperature value from probe #4 went offscale, resulting in a zero value for the soil energy storage term calculated from that probe and thus no contribution to the total soil heat flux for soils set 4 and the same for average soil heat flux. This led to incorrect sensible and latent heat flux values. The fields affected were: 30 minute: ts4, ces4, g4, ave_shf, e, h 15 minute: rr_ts4. |
Measurements: | sgp15ebbrE7.a1:
sgp30ebbrE7.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
06/30/1994 | 1600 | 06/30/1994 | 1730 |
07/03/1994 | 0830 | 07/11/1994 | 2300 |
Subject: | SGP/EBBR/E4 - Wind Direction Sensor Malfunction |
DataStreams: | sgp15ebbrE4.a1, sgp30ebbrE4.a1, sgp5ebbrE4.a0 |
Description: | During two periods recently, the wind direction sensor at E4, Plevna, KS malfunctioned. The first time period was caused by water in the connector to the sensor. The second period was apparently a result of an electronics problem in the sensor circuitry. On June 30, at 1646 GMT sensor S/N 3036 was removed and replaced with S/N 3034. On July 11, at 2003 GMT, sensor S/N 3034 was replaced with S/N 3038. The periods of time listed above are inclusive for the 30 minute data. Slightly less of the 5 and 15 minute values were affected (at the beginning or end of the periods), as is obvious from the sensor replacement times. All of the data should be considered incorrect. The affected data are: 5 minute: res_ws, wind_d, sigma_wd 15 minute: mv_wind_d 30 minute: res_ws, wind_d, sigma_wd |
Measurements: | sgp5ebbrE4.a0:
sgp15ebbrE4.a1:
sgp30ebbrE4.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
07/22/1994 | 1200 | 08/04/1994 | 1600 |
Subject: | SGP/EBBR/E12 - Stopped Ventilation Fan |
DataStreams: | sgp15ebbrE12.a1, sgp30ebbrE12.a1, sgp5ebbrE12.a0 |
Description: | On August 4, 1994, a site operator discovered the ventilation fan of the EBBR to be stopped; the fan guard was clogged with animal remains. Inspection of the EBBR data from Pawhuska, OK, E12 indicates that this condition occurred from July 22 through August 4. Lack of ventilation of the temperature and relative humidity sensors attached to the AEM results in questionable measurements of air temperature, relative humidity, and all quantities calculated from them, including sensible and latent heat fluxes. The quantities that are questionable for the period indicated are: 5 minute: tair_top, tair_bot, thum_top, thum_bot, hum_top, hum_bot, vp_top, and vp_bot 15 minute: rr_thum_r, rr_thum_l, mv_hum_r, mv_hum_l, tair_r, tair_l 30 minute: tair_top, tair_bot, thum_top, thum_bot, hum_top, hum_bot, vp_top, vp_bot, bowen, e, h |
Measurements: | sgp5ebbrE12.a0:
sgp30ebbrE12.a1:
sgp15ebbrE12.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
08/19/1994 | 0100 | 08/23/1994 | 1530 |
Subject: | SGP/EBBR/E9 - Malfunctioning Wind Dir Sensor, Incorrect SM2 Results |
DataStreams: | sgp15ebbrE9.a1, sgp30ebbrE9.a1, sgp5ebbrE9.a0 |
Description: | It has been reported previously that a malfunction of the wind direction sensor resulting in zero or 135 degree outputs can cause the soil moisture #2 sensor to read offscale. The two sensors are attached to a multiplexer pair. The manufacturer of the multiplexer and data acquisition system have not been able to explain how our instrument configuration can cause this effect. Shortly after 0030 GMT on August 20, 1994 significant rainfall occurred, being reflected in more than a doubling of soil moisture within an hour. During the time period listed above, the wind direction sensor mulfunctioned (apparently caused by water in the wind direction sensor electronics), causing the following data fields to be incorrect: 5 minute: res_ws, wind_d, sigma_wd 15 minute: mv_wind_dir 30 minute: res_ws, wind_d, sigma_wd. During part of the listed period, Soil Moisture #2 was also incorrect, being offscale; during those times the following 30 minute data is also incorrect: 30 minute: sm2, c_shf2, ave_shf, cs2, ces2, g2, h, e. |
Measurements: | sgp5ebbrE9.a0:
sgp15ebbrE9.a1:
sgp30ebbrE9.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
08/17/1994 | 1700 | 08/17/1994 | 2300 |
Subject: | SGP/EBBR/E9 - Reprocess: Soil Heat Flux Out of Range |
DataStreams: | sgp15ebbrE9.a1, sgp30ebbrE9.a1 |
Description: | For an unknown reason, soil heat flux sensor #5 indicated too small a value for the period listed above. This resulted in an incorrect average of soil heat flow for the five sets of soil heat flow plates, and therefore incorrect e (latent heat flux) and h (sensible heat flux) in the 30 minute data. The following data values are incorrect: 15 minute: mv_hft5 30 minute: shf5, c_shf5, ave_shf, g5, e, h The latent and sensible heat flux can be recalculated by using only soil heat flows 1 through 4 to calculate the average soil heat flow, ave_shf = (g1 + g2 + g3 + g4)/4 e = -(q + ave_shf)/(1 + bowen) h = -(e + ave_shf + q). |
Measurements: | sgp15ebbrE9.a1:
sgp30ebbrE9.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
08/19/1994 | 1900 | 08/24/1994 | 1600 |
Subject: | SGP/EBBR/E8 - Battery Voltage Drop |
DataStreams: | sgp15ebbrE8.a1, sgp30ebbrE8.a1, sgp5ebbrE8.a0 |
Description: | Sometime after 0000 GMT on August 19, 1994 the cable from the solar panel to the EBBR battery was broken, presumably the result of severe weather that was in the area. The result was that the battery could not be charged by the solar panel, leading to a gradual reduction in battery voltage. By 1730 GMT on the 19th, the battery voltage had dropped to 10.8 volts and at about 1905 GMT had dropped too low to power the AEM. Some thirty minute data after 1900 GMT is therefore incorrect. By 2000 GMT the voltage had dropped to 10.7 volts and was too low to properly power the barometric pressure sensor (it's output dropped off from then on). At 1530 GMT on August 24, 1994 the solar panel connection to the battery was reestablished and normal data acquisition resumed at 1600 GMT. The last data file to be produced was apparently 0000 GMT (15 minute file) on 20 August. In an apparently related incident, soil temperature #3 skyrocketed in output beginning at about 1815 GMT; the cause for this is unknown, but is probably a result of the inability of the CR10 data logger to correctly measure the sensor resistance. By 1900 GMT this situation had caused elevated average soil heat flux, which in turn affected calculated e and h. Data fields that are incorrect for the time period listed, follow: 5 minute: tair_top, tair_bot, thum_top, thum_bot, hum_top, hum_bot, vp_top, vp_bot 15 minute: rr_thum_r, rr_thum_l, mv_hum_r, mv_hum_l, tair_r, tair_l 30 minute: tair_top, tair_bot, thum_top, thum_bot, hum_top, hum_bot, vp_top, vp_bot, bowen, e, h |
Measurements: | sgp15ebbrE8.a1:
sgp5ebbrE8.a0:
sgp30ebbrE8.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
08/20/1994 | 0130 | 08/23/1994 | 1600 |
Subject: | SGP/EBBR/E9 - Hail Damage to Net Radiometer and Wind Speed Sensor |
DataStreams: | sgp15ebbrE9.a1, sgp30ebbrE9.a1, sgp5ebbrE9.a0 |
Description: | Golf ball size hail was reported for the Ashton site for early August 20, 1994. It damaged the wind speed sensor and the net radiometer shortly before 0130 GMT. The following data fields are to be flagged as incorrect for the periods listed above (resultant wind speed has already been indicated as incorrect in a previous DQR that documented the malfunction of the wind direction sensor): 5 minute: wind_s, res_ws, q 15 minute: wind_s, mv_q 30 minute: wind_s, res_ws, q, h, e. Note that h and e are also incorrect as a consequence of q being incorrect. |
Measurements: | sgp5ebbrE9.a0:
sgp15ebbrE9.a1:
sgp30ebbrE9.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
08/09/1994 | 0000 | 08/23/1994 | 1922 |
Subject: | Stopped Ventilation Fan |
DataStreams: | sgp15ebbrE7.a1, sgp30ebbrE7.a1, sgp5ebbrE7.a0 |
Description: | DQR No: Platform: EBBR Subject: Stopped Ventilation Fan Date Submitted: 30 August 1994 Submitted By: _x_ Instrument Mentor ___ EST Member ___ Science Team Member ___ Other _____________________________ For questions or problems, please contact the ARM Experiment Center at 509-375-6898 or via email at dqr@arm.gov. Platform/Measurement: What level data: (raw,a0,a1,b1,c1 etc): a0 (5 minute), a1 (15 and 30 minute) What location was the data collected at: E7, Elk Falls, KS Period of time in question Begin Date 8/9/94 End Date 8/23/94 Time 1922 GMT Data should be labeled: ___ questionable ___ All data fields affected ___ incorrect _x_ Only some data fields affected ___ wrong calibration _x_ others (information only) Discussion of Problem: Sometime between August 9 and 23, 1994 the ventilation fan of the EBBR stopped; the fan guard was clogged with insect remains. The fan was restarted at 1922 GMT on 23 August. Inspection of the EBBR data does not indicate any ill affects on the calculated sensible and latent heat during the period. The fan may have stopped soon before the arrival of the site operator on 23 August. I cannot suggest flagging the data as incorrect, but this message should still be attached to the data so that anyone who might discover something unusual may have some basis for explaining it. The quantities that are normally affected by stoppage of the ventilation to the temperature and relative humidity sensors are: 5 minute: tair_top, tair_bot, thum_top, thum_bot, hum_top, hum_bot, vp_top, and vp_bot 15 minute: rr_thum_r, rr_thum_l, mv_hum_r, mv_hum_l, tair_r, tair_l 30 minute: tair_top, tair_bot, thum_top, thum_bot, hum_top, hum_bot, vp_top, vp_bot, bowen, e, h Other observations/measurements impacted by this problem: see list above Suggested Corrections of the Problem: (e.g. change calibration factor and recompute, flag data with this comment, etc.) Enclose the message above with the data if possible. Data Processing Notes Date ------------------------------------------------------------------- END |
Measurements: | sgp30ebbrE7.a1:
sgp15ebbrE7.a1:
sgp5ebbrE7.a0:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
08/20/1994 | 0230 | 08/31/1994 | 1542 |
Subject: | SGP/EBBR/E12 - Miscellaneous Problems Affecting Data |
DataStreams: | sgp15ebbrE12.a1, sgp30ebbrE12.a1, sgp5ebbrE12.a0 |
Description: | Three hardware problems occurred at E12, Pawhuska, OK in late August 1994. On August 12 the wind direction sensor malfunctioned. Therefore, all wind direction, sigma, and resultant wind speed values for the period above are incorrect. The wind direction sensor was replaced on August 31. Affected data are: 5 minute: wind_d, sigma_wd, res_ws 15 minute: mv_wind_d 30 minute: wind_d, sigma_wd, res_ws. Water accumulated in the AEM motor box and apparently caused a reduction in the voltage level of the home signal (battery condition was very good and so was not the cause); by late August 27 the hom30 level had fallen below the minimum qc check level. The AEM continued to exchange properly. The minimum qc level check is intended to help detect either a non-operating AEM or low battery condition. The Campbell CR10 software operates properly unless the hom30 signal is thirty-five or greater. So the low hom30 values do not result in any incorrect data!!!. I point this out because this situation demonstrates a condition flagged by the qc checks, even though no effect on the data has occurred. The AEM box was dried out and new dessicant placed in it on August 31. On August 28, 1994 the left AEM housing ventilation fan ceased to operate because of clogging of the ventilation system with debris. Fifteen minute data seems to indicate that the fan stopped operating just before 1245 GMT. This is at least the third such incidence of clogging this summer at different EBBRs. The clog was removed and ventilation restored on August 31. The lack of ventilation caused improper measurements of temperature and relative humidity in the left housing (these are quite obvious in the 15 minute data but difficult to detect in the 30 minute data) and therefore incorrect values of sensible and latent heat. Affected data are: 5 minute: tair_top, tair_bot, thum_top, thum_bot, hum_top, hum_bot, vp_top, vp_bot 15 minute: rr_thum_l, mv_hum_l, tair_l 30 minute: tair_top, tair_bot, thum_top, thum_bot, hum_top, hum_bot, vp_top, vp_bot, bowen, e, h. |
Measurements: | sgp5ebbrE12.a0:
sgp30ebbrE12.a1:
sgp15ebbrE12.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
09/01/1994 | 1700 | 09/01/1994 | 2230 |
09/03/1994 | 1530 | 09/07/1994 | 1700 |
Subject: | SGP/EBBR/E8 - Data Corruption and Loss |
DataStreams: | sgp15ebbrE8.a1, sgp30ebbrE8.a1, sgp5ebbrE8.a0 |
Description: | Data loss was experienced during the periods indicated for unknown reasons. My understanding is that ingestion of the data failed for these periods because the record length was shorter than it is supposed to be. Site Operations personnel visited the site on September 7 and powered down and then up, the EBBR, essentially causing a reload of the CR10 program. All output locations had been -9999 or 0000 when they had arrived. The battery condition was normal. Failure of a portion of the storage module may be indicated; data sneakernetted from the storage module shows an alternating sequence of two days, September 2 and 3 and then a stretch of garbage characters. No other days of data are found. The portion of the storage module memory that contained the program was not corrupted, as the CR10 program compiled and ran properly when it was reloaded from the storage module. The data after the period above is reasonable. The last part of the storage module memory may be bad and perhaps in trying to access it remotely multiple times the situation above resulted. |
Measurements: | sgp15ebbrE8.a1:
sgp5ebbrE8.a0:
sgp30ebbrE8.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
09/12/1994 | 1300 | 09/14/1994 | 1847 |
Subject: | SGP/EBBR/E20 - Fan Stopped, T and RH Biases |
DataStreams: | sgp15ebbrE20.a1, sgp30ebbrE20.a1, sgp5ebbrE20.a0 |
Description: | Another fan stoppage situation occurred. This is the fourth one in the last few months and may indicate a weakening of the fans that aspirate the temperature, relative humidity housings. The 15 minute data reveals that the stoppage occurred at approximately 1300 GMT on September 12. The left fan was cleaned out by site operations personnel and began running again at 1847 GMT on September 14. The 15 minute data during this period shows that during daytime, the left temperature was greater than the right temperature and that the left relative humidity was lower than the right relative humidity (a consequence of greater temperature), irregardless of the positions of the housings. The bowen ratio, sensible heat flux and latent heat flux for this period, as well as all left housing temperatures and relative humidities are incorrect. The data values that are incorrect are: 5 minute: tair_top, tair_bot, thum_top, thum_bot, hum_top, hum_bot, vp_top, vp_bot 15 minute: rr_thum_l, mv_hum_l, tair_l, 30 minute: tair_top, tair_bot, thum_top, thum_bot, hum_top, thum_bot, vp_top, vp_bot, bowen, e, h Because of the increased frequency of fan stoppage occurrences, I have submitted a work request to site operations to use the portable vane anemometer to check the flow of the housing fans on each EBBR and visually check (and clean if needed) the fans for debris that would restrict the flow. Included in this work request are instructions for checking the performance of the temperature and relative humidity sensors by manually putting the aspirator housings at the same height for a half hour period (so that two 15 minute and one half hour comparison result). The latter part of the work request is prompted by my close inspection of the Meeker data for the last few weeks. It is clear that significant biases have developed in the pairs of temperature and relative humidity sensors; left thermocouple ~0.5 deg. C greater than right thermocouple, left relative humidity ~5% lower than right relative humidity. Biases were expected in operating the systems over long time periods, and these appear to be the result of simple offsets, not changes in calibrations. At this point, I just want to determine how large the offsets are. Comparison of these offsets between EBBR units, in light of the different lengths of time that EBBR units and individual sensors have been deployed, may provide some interesting information on likely offset changes with time. |
Measurements: | sgp30ebbrE20.a1:
sgp5ebbrE20.a0:
sgp15ebbrE20.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
08/18/1994 | 1200 | 09/21/1994 | 1530 |
Subject: | Intermittent Stopped or Slowed Aspirator Fans |
DataStreams: | sgp15ebbrE7.a1, sgp30ebbrE7.a1, sgp5ebbrE7.a0 |
Description: | DQR No: Platform: EBBR Subject: Intermittent Stopped or Slowed Aspirator Fans Date Submitted: 26 September 1994 Submitted By: _x_ Instrument Mentor ___ EST Member ___ Science Team Member ___ Other _____________________________ For questions or problems, please contact the ARM Experiment Center at 509-375-6898 or via email at dqr@arm.gov. Platform/Measurement: EBBR/T and RH What level data: (raw,a0,a1,b1,c1 etc): a0 (5 minute), a1 (15 and 30 minute) What location was the data collected at: E7, Elk Falls, KS Period of time in question Begin Date 8/18/94 Time 1200 GMT End Date 9/21/94 Time 1530 GMT Data should be labeled: ___ questionable ___ All data fields affected _X_ incorrect _x_ Only some data fields affected ___ wrong calibration ___ others (information only) Discussion of Problem: Around 1200 GMT on September 21, 1994 the aspirator fans of the EBBR intermittently stopped or slowed significantly; the fans were clogged with insect remains and spider webs. Only a few weeks earlier the same situation occurred at this EBBR. The 15 minute data reveals that most of the time the right aspirator fan was the one that failed to work, although there are times that it appears that the left fan was either not working also or was the only one not working. Unlike the previous occurrence, the 30 minute flux data does show some indication of this problem, although, as usual, it is far easier to see in the 15 minute data. The fans were cleaned out and restarted at 1530 GMT on September 21, 1994. The data listed below should be flagged as incorrect for the period shown above. 5 minute: tair_top, tair_bot, thum_top, thum_bot, hum_top, hum_bot, vp_top, and vp_bot 15 minute: rr_thum_r, rr_thum_l, mv_hum_r, mv_hum_l, tair_r, tair_l 30 minute: tair_top, tair_bot, thum_top, thum_bot, hum_top, hum_bot, vp_top, vp_bot, bowen, e, h Other observations/measurements impacted by this problem: see list above Suggested Corrections of the Problem: (e.g. change calibration factor and recompute, flag data with this comment, etc.) Enclose the message above with the data if possible. Data Processing Notes Date ------------------------------------------------------------------- END |
Measurements: | sgp30ebbrE7.a1:
sgp15ebbrE7.a1:
sgp5ebbrE7.a0:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
09/29/1994 | 1530 | 09/29/1994 | 1600 |
Subject: | SGP/EBBR/E20 - Soil Moisture Probe Failure |
DataStreams: | sgp15ebbrE20.a1, sgp30ebbrE20.a1 |
Description: | Soil moisture probe #4 went offscale for a short period, for unknown reasons. However, it may have resulted from Site Operations Preventative Maintenance activities that were taking place at the time. The times of incorrect values are listed below. 30 minute: 1600 GMT; sm4, c_shf4, cs4, ces4, g4, ave_shf, e, h 15 minute: 1600 GMT; r_sm4 |
Measurements: | sgp30ebbrE20.a1:
sgp15ebbrE20.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
09/13/1994 | 1600 | 09/27/1994 | 1600 |
Subject: | SGP/EBBR/E22 - Net Radiometer Hemisphere Changes |
DataStreams: | sgp15ebbrE22.a1, sgp30ebbrE22.a1, sgp5ebbrE22.a0 |
Description: | The upper hemisphere of the net radiometer at the site was punctured allowing water to collect in the lower (and sometimes upper) section of the sensor. The punctures are most likely the result of migratory birds (a problem that we have experienced almost every year here at ANL also). The punctures (and water in some net radiometers) did not result in obvious invalidation of the data. Whether there is water in the lower hemisphere or not, a small puncture of the upper hemisphere would not have a major effect on the net radiation measurement. Significant amounts of water in the lower hemisphere should have a major effect on nighttime measurements particularly, although that effect is hard to detect in the data. The date when the puncture occurred is approximate - but is certainly no more than two weeks before the hemisphere was replaced. |
Measurements: | sgp30ebbrE22.a1:
sgp15ebbrE22.a1:
sgp5ebbrE22.a0:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
09/15/1994 | 1600 | 09/29/1994 | 1430 |
Subject: | SGP/EBBR/E12 - Net Radiometer Hemisphere Changes |
DataStreams: | sgp15ebbrE12.a1, sgp30ebbrE12.a1, sgp5ebbrE12.a0 |
Description: | The upper hemisphere of the net radiometer at the site was punctured allowing water to collect in the lower (and sometimes upper) section of the sensor. The punctures are most likely the result of migratory birds (a problem that we have experienced almost every year here at ANL also). The punctures (and water in some net radiometers) did not result in obvious invalidation of the data. Whether there is water in the lower hemisphere or not, a small puncture of the upper hemisphere would not have a major effect on the net radiation measurement. Significant amounts of water in the lower hemisphere should have a major effect on nighttime measurements particularly, although that effect is hard to detect in the data. The date when the puncture occurred is approximate - but is certainly no more than two weeks before the hemisphere was replaced. |
Measurements: | sgp5ebbrE12.a0:
sgp30ebbrE12.a1:
sgp15ebbrE12.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
09/26/1994 | 1530 | 10/11/1994 | 1910 |
Subject: | SGP/EBBR/E15 - Net Radiometer Hemisphere Changes |
DataStreams: | sgp15ebbrE15.a1, sgp30ebbrE15.a1, sgp5ebbrE15.a0 |
Description: | The upper hemisphere of the net radiometer at the site was punctured allowing water to collect in the lower (and sometimes upper) section of the sensor. The punctures are most likely the result of migratory birds (a problem that we have experienced almost every year here at ANL also). The punctures (and water in some net radiometers) did not result in obvious invalidation of the data. Whether there is water in the lower hemisphere or not, a small puncture of the upper hemisphere would not have a major effect on the net radiation measurement. Significant amounts of water in the lower hemisphere should have a major effect on nighttime measurements particularly, although that effect is hard to detect in the data. The date when the puncture occurred is approximate - but is certainly no more than two weeks before the hemisphere was replaced. |
Measurements: | sgp5ebbrE15.a0:
sgp30ebbrE15.a1:
sgp15ebbrE15.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
09/29/1994 | 1530 | 09/29/1994 | 1730 |
Subject: | SGP/EBBR/E20 - Aspirator Fan Stoppage |
DataStreams: | sgp15ebbrE20.a1, sgp30ebbrE20.a1 |
Description: | During Site Operations Preventative Maintenance activities the left AEM fan stopped operating. This affected some of the data being collected. The times of incorrect values are listed below. 15 minute: 1530-1715 GMT; tair_l, mv_hum_l, rr_thum_l 30 minute: 1530-1730 GMT; thum_top, thum_bot, tair_top, tair_bot, hum_top, hum_bot, e, h, bowen |
Measurements: | sgp30ebbrE20.a1:
sgp15ebbrE20.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
10/13/1994 | 2300 | 10/14/1994 | 1900 |
Subject: | SGP/EBBR/E13 - Soil Temperature Aberations |
DataStreams: | sgp15ebbrE13.a1, sgp30ebbrE13.a1 |
Description: | For a period of not quite a day, soil temperature probe #4 indicated values that were either too high or too low, for unknown reasons. After Site Operations personnel checked connectors and the probe itself, it recovered to proper values. The probe has functioned properly since then. The times and incorrect data fields are listed below. 15 minute: rr_ts4, 10/13/94: 2245 GMT; 10/14/94: 0000, 0200, 0230, 0515, 0600, 0630, 1300-1500, 1530-1715, 1815, 1845 GMT 30 minute: ts4, 10/13/94: 2300 GMT; 10/14/94: 0000, 0230, 0530-0630, 1300-1700, 1830-1900 GMT ces4, g4, ave_shf, e, h, 10/14/94: 0030, 0200-0230, 0600-0630, 1300-1900 GMT |
Measurements: | sgp15ebbrE13.a1:
sgp30ebbrE13.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
09/03/1994 | 1900 | 09/15/1994 | 1330 |
Subject: | SGP/EBBR/E12 - Low home_15 Values |
DataStreams: | sgp15ebbrE12.a1, sgp30ebbrE12.a1, sgp5ebbrE12.a0 |
Description: | The home signal values for the EBBR system installed at E12, Pawhuska, OK have generally been lower than for the other EBBR systems. However, during the period above the home_15 value was often lower than 35, which is then improperly interpreted by the CR10 software. A home_15 value less than 35 is interpreted as meaning that the AEM aspirated housings (which hold the temperature and relative humidity sensors) are in the opposite orientation to what they actually are. The AEM continues to exchange properly, but the resulting calculations of Bowen ratio, latent heat flux, and sensible heat flux are incorrect. On September 15, 1994 Site Operations personnel refurbished the wiring for the left housing and the home_15 signal returned to proper levels. When 30 minute home_15 values are below 35, the data fields listed below are incorrect. 5 minute: home, tair_top, tair_bot, thum_top, thum_bot, hum_top, hum_bot, vp_top, vp_bot 15 minute: mv_home 30 minute: home_15, tair_top, tair_bot, thum_top, thum_bot, hum_top, hum_bot, vp_top, vp_bot, Bowen, e, h It is possible to recalculate the Bowen ratio, e, and h by using the 15 minute data to compute the correct gradients of temperature and relative humidity (two 15 minute periods are averaged to give a half hour value); the orientation of the AEM is obvious in the 15 minute data, based on the home signal (which is largest for the first 15 minutes of the half hour). More information on performing this recalculation can be obtained from the mentor. |
Measurements: | sgp5ebbrE12.a0:
sgp30ebbrE12.a1:
sgp15ebbrE12.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
09/29/1994 | 1715 | 09/29/1994 | 1800 |
Subject: | SGP/EBBR/E20 - Net Radiometer Hemisphere Changes |
DataStreams: | sgp15ebbrE20.a1, sgp30ebbrE20.a1, sgp5ebbrE20.a0 |
Description: | Incorrect data during hemisphere change. |
Measurements: | sgp30ebbrE20.a1:
sgp5ebbrE20.a0:
sgp15ebbrE20.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
10/11/1994 | 1915 | 10/11/1994 | 1930 |
Subject: | SGP/EBBR/E15 - Net Radiometer Hemisphere Changes |
DataStreams: | sgp15ebbrE15.a1, sgp30ebbrE15.a1, sgp5ebbrE15.a0 |
Description: | Incorrect data during hemisphere change. |
Measurements: | sgp5ebbrE15.a0:
sgp30ebbrE15.a1:
sgp15ebbrE15.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
09/14/1994 | 1600 | 09/29/1994 | 1735 |
Subject: | SGP/EBBR/E20 - Net Radiometer Hemisphere Changes |
DataStreams: | sgp15ebbrE20.a1, sgp30ebbrE20.a1, sgp5ebbrE20.a0 |
Description: | The upper hemisphere of the net radiometer at the site was punctured allowing water to collect in the lower (and sometimes upper) section of the sensor. The punctures are most likely the result of migratory birds (a problem that we have experienced almost every year here at ANL also). The punctures (and water in some net radiometers) did not result in obvious invalidation of the data. Whether there is water in the lower hemisphere or not, a small puncture of the upper hemisphere would not have a major effect on the net radiation measurement. Significant amounts of water in the lower hemisphere should have a major effect on nighttime measurements particularly, although that effect is hard to detect in the data. The date when the puncture occurred is approximate - but is certainly no more than two weeks before the hemisphere was replaced. |
Measurements: | sgp30ebbrE20.a1:
sgp5ebbrE20.a0:
sgp15ebbrE20.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
10/21/1994 | 0300 | 11/02/1994 | 1715 |
Subject: | SGP/EBBR/E8 - Water in Net Radiometer |
DataStreams: | sgp15ebbrE8.a1, sgp30ebbrE8.a1, sgp5ebbrE8.a0 |
Description: | At some time previous to October 21, 1994, the top hemisphere of the net radiometer of the EBBR at E8 was pierced, probably by migrating birds. A DQR was issued by me a couple of weeks ago indicating other extended facilities at which this has happened. Net radiometer data was correct until October 21 at sometime between 0230 and 0300 GMT, when rain began to enter the radiometer; the effect can be easily seen in the data. Collection of 3/4 inch of water in the bottom hemisphere was not the only consequence of the situation. Unlike other net radiometers that have had this experience, this one produced incorrect data during daylight hours as well as during nightime hours until the water was removed, the sensor dried, and the hemispheres were replaced on November 2, 1994. During the period listed above, the following data are incorrect and cannot be recalculated: 5 minute: q 15 minute: mv_q 30 minute: q, h, e Science Team members or others using the data should recognize that the flux data is not correct for this fairly lengthy time period. |
Measurements: | sgp15ebbrE8.a1:
sgp5ebbrE8.a0:
sgp30ebbrE8.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
10/20/1994 | 0000 | 11/01/1994 | 1540 |
Subject: | SGP/EBBR/E7 - Net Radiometer not level |
DataStreams: | sgp15ebbrE7.a1, sgp30ebbrE7.a1, sgp5ebbrE7.a0 |
Description: | Sometime between 0000 and 1200 GMT on October 20, 1994, the net radiometer support of the EBBR at E7 was bent down at about a 30 degree angle, probably by migrating birds. A couple of DQRs have been issued by me indicating other extended facilities at which birds have caused incorrect data from net radiometers. The net radiometer support was probably loose to begin with. The effect can be easily seen in the data, when comparison is made to the EBBR data at Ashton, KS. Since the net radiometer support extends south from the EBBR, the net radiation values are high during the period above, leading to incorrect values of latent and sensible heat fluxes. Until the net radiometer was levelled on November 1, 1994, the net radiation was approximately 26% high at solar noon, although it may have been incorrect by a smaller percentage at night. From October 22 through 28 the half hour of data nearest solar noon averaged 497 watts per meter squared at Elk Falls and only 396 at Ashton. During the period listed above, the following data are incorrect and cannot be recalculated: 5 minute: q 15 minute: mv_q 30 minute: q, h, e Science Team members or others using the data should recognize that the flux data is not correct for this fairly lengthy time period. |
Measurements: | sgp15ebbrE7.a1:
sgp30ebbrE7.a1:
sgp5ebbrE7.a0:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
12/02/1994 | 1937 | 12/02/1994 | 2000 |
Subject: | SGP/EBBR/E13 - Net Radiation - Hemisphere Replacement |
DataStreams: | sgp15ebbrE13.a1, sgp30ebbrE13.a1, sgp5ebbrE13.a0 |
Description: | The upper hemisphere of the net radiometer was punctured (pinhole) and thus was replaced at 1937 GMT on December 2, 1994. This resulted in a spike in the net radiation data. 5 minute q data for 1935, 1940, 1945, and 1955 GMT, 15 minute mv_q data for 1945 and 2000 GMT, and 30 minute q, e, and h data for 2000 GMT are incorrect. |
Measurements: | sgp5ebbrE13.a0:
sgp15ebbrE13.a1:
sgp30ebbrE13.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
11/15/1994 | 2300 | 11/30/1994 | 1600 |
Subject: | SGP/EBBR/E7 - Radiation Shield Problem |
DataStreams: | sgp30ebbrE7.a1, sgp5ebbrE7.a0 |
Description: | The right radiation shield was out of position or off during the period of time indicated. This may or may not have occurred as a result of preventative maintenance on November 15. All air and humidity probe temperatures (except the reference temperature), relative humidities, vapor pressures, Bowen ratio, sensible heat flux, and latent heat flux during this period are questionable. During a large part of the period the resultant sensible and latent heat fluxes look reasonable. However, during part of the period, the difference in relative humidity between the two EBBR levels appears to be much too large. Unusual differences in temperatures are not as obvious. |
Measurements: | sgp30ebbrE7.a1:
sgp5ebbrE7.a0:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
12/06/1994 | 1200 | 12/09/1994 | 1930 |
Subject: | SGP/EBBR/E4 - Frozen Wind Instruments |
DataStreams: | sgp15ebbrE4.a1, sgp30ebbrE4.a1, sgp5ebbrE4.a0 |
Description: | On December 6, 1994 a frontal system deposited freezing rain in central Kansas that resulted in the EBBR wind instrument becoming frozen in place at E4 for a few days. The direction and speed instruments were frozen for slightly differents lengths of time. The times and fields to be indicated as incorrect are shown below (all 5, 15, and 30 minute data measured during the periods, inclusive, is incorrect): Wind Speed: 12/06/94 1200 GMT - 12/09/94 1930 GMT 5 minute: wind_s, res_ws 15 minute: wind_s 30 minute: wind_s, res_ws Wind Direction: 12/06/94 1400 GMT - 12/08/94 2230 GMT 5 minute: wind_d, sigma_wd 15 minute: mv_wind_d 30 minute: wind_d, sigma_wd |
Measurements: | sgp5ebbrE4.a0:
sgp15ebbrE4.a1:
sgp30ebbrE4.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
12/06/1994 | 1200 | 12/09/1994 | 1530 |
Subject: | SGP/EBBR/E8 - Frozen Wind Instruments |
DataStreams: | sgp15ebbrE8.a1, sgp30ebbrE8.a1, sgp5ebbrE8.a0 |
Description: | On December 6, 1994 a frontal system deposited freezing rain in central Kansas that resulted in the EBBR wind instruments becoming frozen in place at two extended facilities (E4 and E8) for a few days. The direction and speed instruments were frozen for slightly differents lengths of time. The times and fields to be indicated as incorrect are shown below (all 5, 15, and 30 minute data measured during the periods, inclusive, is incorrect): Wind Speed: 12/06/94 1200 GMT - 12/09/94 1530 GMT 5 minute: wind_s, res_ws 15 minute: wind_s 30 minute: wind_s, res_ws Wind Direction: 12/06/94 1730 GMT - 12/07/94 1830 GMT 5 minute: wind_d, sigma_wd 15 minute: mv_wind_d 30 minute: wind_d, sigma_wd |
Measurements: | sgp15ebbrE8.a1:
sgp5ebbrE8.a0:
sgp30ebbrE8.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
08/19/1994 | 1700 | 08/19/1994 | 2300 |
10/13/1994 | 1800 | 10/14/1994 | 1500 |
10/17/1994 | 2030 | 10/17/1994 | 2100 |
10/28/1994 | 2030 | 10/28/1994 | 2230 |
12/20/1994 | 0630 | 12/23/1994 | 0530 |
12/26/1994 | 1700 | 12/27/1994 | 0130 |
12/27/1994 | 1600 | 12/27/1994 | 1630 |
01/02/1995 | 0600 | 01/05/1995 | 1700 |
01/05/1995 | 2200 | 01/09/1995 | 0230 |
01/09/1995 | 0900 | 01/14/1995 | 0400 |
01/14/1995 | 0800 | 01/15/1995 | 0300 |
01/15/1995 | 1200 | 01/16/1995 | 1600 |
Subject: | SGP/EBBR/E9 - Reprocess: Soil Heat Flow Sensor 5 Incorrect Data |
DataStreams: | sgp15ebbrE9.a1, sgp30ebbrE9.a1 |
Description: | Soil heat flow sensor #5 periodically outputted incorrect values from mid-August 1994 until mid-January 1995. The output often indicated large negative heat flow. The sensor was replaced on January 23, 1995, even though the previous week of data was correct. The data affected (and thus incorrect) includes: 15 minute: mv_hft5 30 minute: shf5, c_shf5, g5, ave_shf, e, h. The dates and times (GMT) of incorrect values are listed below. Only half hour times are listed. 08/19/94 1700-2300 10/13/94 1800-2330 10/14/94 0000-1500 10/17/94 2030-2100 10/28/94 2030-2230 12/20/94 0630-2330 12/21/94 0000-2330 12/22/94 0000-2330 12/23/94 0000-0530 12/26/94 1700-2330 12/27/94 0000-0130, 1630 01/02/95 0600-2330 01/03/95 0000-2330 01/04/95 0000-2330 01/05/95 0000-1700, 2200-2330 01/06/95 0000-2330 01/07/95 0000-2330 01/08/95 0000-2330 01/09/95 0000-0230, 0900-2330 01/10/95 0000-2330 01/11/95 0000-2330 01/12/95 0000-2330 01/13/95 0000-2330 01/14/95 0000-0400, 0800-2330 01/15/95 0000-0300, 1200-2330 01/16/95 0000-1600 The latent and sensible heat fluxes can be recalculated by using only soil heat flows 1 through 4 to calculate the average soil heat flow, ave_shf = (g1 + g2 + g3 + g4)/4 e = -(q + ave_shf)/(1 + bowen) h = -(e + ave_shf + q) |
Measurements: | sgp15ebbrE9.a1:
sgp30ebbrE9.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
02/14/1994 | 0700 | 02/15/1994 | 0030 |
Subject: | SGP/EBBR/E4 - Frozen Wind Speed Sensor |
DataStreams: | sgp15ebbrE4.a1, sgp30ebbrE4.a1, sgp5ebbrE4.a0 |
Description: | On February 14, 1994 a frontal system deposited freezing rain in central Kansas that resulted in the EBBR wind speed instrument becoming frozen in place at Plevna (E4) for part of two days. All 5, 15, and 30 minute data values indicated below are incorrect for the period listed above. 5 minute: wind_s, res_ws 15 minute: wind_s 30 minute: wind_s, res_ws |
Measurements: | sgp5ebbrE4.a0:
sgp15ebbrE4.a1:
sgp30ebbrE4.a1:
|